Pratique du Shadowing: What's an if statement? 🤔 - Apprendre l'anglais à l'oral avec la vidéo
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All right guys, we are on if statements.
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With an if statement, you do something if a condition you set is true.
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If not, then don't do it.
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It's as simple as that.
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We'll ask a user what their age is.
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If their age is greater than or equal to 18, they'll be allowed into our site.
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If they're under 18, well, we won't let them in.
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Let's declare variable age.
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Int age.
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Then we'll create a prompt.
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standard output enter your age.
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Standard input age.
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Okay, this is how to write an if statement.
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You type if, then a set of parentheses, then a set of curly braces.
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If some condition within the parentheses is true, you perform some subset of code.
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We are going to check if age is greater than or equal to 18.
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Greater than or equal to is a comparison operator.
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There's other comparison operators such as less than or equals to, less than, greater than.
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If you need to compare if two values are equal, you use two equal signs.
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You don't wanna say equals because then you're setting age equal to 18.
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Equals is the assignment operator.
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So let's check to see if age is greater than or equal to 18.
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Then we'll print a message.
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Standard output.
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Welcome to the site.
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Okay, let's Let's try this.
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Enter your age.
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Let's say that I'm 12.
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Well, it doesn't do anything.
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Since this condition evaluated to be false, we skip over this body of code.
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If it were true, then we execute it.
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This time my age is 21.
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I hit enter.
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Welcome to the site.
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If you would rather do something else if a condition is false, you can use an else statement.
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An else statement you will place at the end.
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There is no condition.
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Else, we will print standard output.
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You are not old enough to enter.
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Okay, let's try this again.
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Enter your age.
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I'll say that I'm 12.
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You are not old enough to enter.
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That's an if statement.
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If some condition is true, you do something.
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If not, you can do something else or nothing at all.
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There are more conditions you can check by using an else if statement.
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We can check another condition by adding else if.
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If this condition is false, check this else if condition.
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Let's check to see if age is less than zero.
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That means somebody hasn't been born yet.
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You haven't been born yet.
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Okay, now check this out.
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Let's say that my age is negative 10.
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Then I hit enter.
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You haven't been born yet.
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Since this condition was false, we skip this section of code.
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Then we check the else if statement.
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Since this condition was true, we execute this body of code.
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Then skip over the else statement.
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Let's add one more else if statement.
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Else if...
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Age is greater than or equal to 100.
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Standard.
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Output.
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You are too old to enter this site.
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Okay, enter your age.
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I am 120 years old.
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I hit enter.
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Welcome to the site.
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We check these conditions one by one starting from the top.
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We stated that our age was 120 years old.
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Even though we were expecting to execute this body of code, we instead executed this body of code within the if statement.
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That's because our age was technically still greater than or equal to 18.
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So the order of your if and else if statements does matter.
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It makes a difference.
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If we need to execute this body of code, if somebody's age is greater than or equal to 100, well then we should probably move that to the top.
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Then turn it into an if statement.
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Else if age is greater than or equal to 18, we will display this message.
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Let's try this one more time.
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Enter your age.
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I am 120 years old.
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I hit enter.
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You are too old to enter this site.
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So yeah, that's an if statement.
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You do something if a condition is true.
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If not, then you don't do it.
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If you would rather do something else, you can use an else statement.
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If there's other conditions you would like to check before reaching the else statement, you can use an else if statement.
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And there's really no limit to these.
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If you would like a copy of this code, I'll post this in the comment section down below.
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And well, yeah, those are if statements in C++.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau B1 s’appuie sur la vidéo « What's an if statement? 🤔 ». Les mots qui reviennent le plus souvent : statement, condition, equal, enter, greater. Cette vidéo contient 92 phrases et 733 mots à répéter en shadowing. La partie parlée dure 4:53. Le locuteur parle à un rythme naturel d’environ 150 mots par minute, proche d’une conversation courante. 92 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc facile à suivre.
Vocabulaire clé de cette vidéo
Les 12 mots les plus avancés de la vidéo, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| execute verbe | /ˈɛksɪˌkjuːt/ | exécuter, mettre à mort |
| skip verbe | /skɪp/ | sautiller |
| operator nom | /ˈɑpəˌɹeɪtɚ/ | téléphoniste |
| parenthesis nom | /pəˈɹɛn.θə.sɪs/ | parenthèse |
| subset nom | /ˈsʌbˌsɛt/ | sous-ensemble |
| curly adjectif | /ˈkɝli/ | bouclé, frisé |
| prompt verbe | /pɹɑmpt/ | inciter |
| evaluate verbe | /ɪˈvaljʊeɪt/ | évaluer |
| declare verbe | /dɪˈklɛɚ/ | déclarer |
| technically adverbe | /ˈtɛk.nɪˌkəl.i/ | techniquement |
| variable adjectif | [ˈvæɹ.i.ə.bl̩] | variable |
| assignment nom | /əˈsaɪn.mənt/ | affectation |
Des phrases à répéter
Des phrases courtes et complètes de la vidéo, à réutiliser dans la conversation de tous les jours :
- We'll ask a user what their age is.
- Then we'll create a prompt.
- Then we'll print a message.
- You haven't been born yet.
- Let's add one more else if statement.
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Phrases conditionnelles if + proposition, will/would + verbe — une condition et son résultat | If they're under 18, well, we won't let · If there's other conditions you would like |
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | be allowed · been born |
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | hasn't been born · haven't been born |
| Comparatifs -er than / more … than — comparer deux éléments | greater than |
Prononciation à surveiller
Le locuteur utilise 19 contractions et formes réduites, comme don't, we'll, haven't. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Mots longs — placez bien l’accent: operator /ˈɑpəˌɹeɪtɚ/, parenthesis /pəˈɹɛn.θə.sɪs/, technically /ˈtɛk.nɪˌkəl.i/
Les sons difficiles pour les francophones :
- /r/ anglais — langue recourbée, sans frotter la gorge: operator /ˈɑpəˌɹeɪtɚ/, parenthesis /pəˈɹɛn.θə.sɪs/, brace /bɹeɪs/, prompt /pɹɑmpt/, variable [ˈvæɹ.i.ə.bl̩]
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme execute, skip, operator.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.