Prática de Shadowing: What's an if statement? 🤔 - Aprenda a falar inglês com vídeo
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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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Vocabulário e dicas de fala para esta lição
Esta aula de conversação de nível B1 usa o vídeo “What's an if statement? 🤔”. As palavras que mais se repetem: statement, condition, equal, enter, greater. Este vídeo tem 92 frases e 733 palavras para praticar shadowing. A fala dura 4:53. O falante fala em ritmo natural, cerca de 150 palavras por minuto, próximo de uma conversa do dia a dia. 92% das palavras estão entre as 3.000 mais comuns do inglês, por isso o vocabulário é fácil de acompanhar.
Vocabulário principal deste vídeo
As 12 palavras mais avançadas do vídeo, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| execute verbo | /ˈɛksɪˌkjuːt/ | executar |
| skip verbo | /skɪp/ | saltitar |
| operator substantivo | /ˈɑpəˌɹeɪtɚ/ | telefonista |
| parenthesis substantivo | /pəˈɹɛn.θə.sɪs/ | parêntese |
| subset substantivo | /ˈsʌbˌsɛt/ | subconjunto |
| curly adjetivo | /ˈkɝli/ | cacheado |
| prompt verbo | /pɹɑmpt/ | incitar, impelir |
| evaluate verbo | /ɪˈvaljʊeɪt/ | avaliar |
| declare verbo | /dɪˈklɛɚ/ | declarar |
| technically advérbio | /ˈtɛk.nɪˌkəl.i/ | na realidade, tecnicamente |
| variable adjetivo | [ˈvæɹ.i.ə.bl̩] | variável |
| assignment substantivo | /əˈsaɪn.mənt/ | designação |
Frases que vale a pena repetir
Frases curtas e completas do vídeo que você pode usar na conversa do dia a dia:
- 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.
Gramática neste vídeo
As estruturas que o falante mais usa, com as palavras exatas do vídeo:
| Estrutura | No vídeo |
|---|---|
| Frases condicionais if + oração, will/would + verbo — uma condição e seu resultado | If they're under 18, well, we won't let · If there's other conditions you would like |
| Voz passiva be + particípio passado — o foco está no que acontece, não em quem faz | be allowed · been born |
| Present perfect have/has + particípio passado — uma ação passada que ainda importa agora | hasn't been born · haven't been born |
| Comparativos -er than / more … than — comparar duas coisas | greater than |
Pronúncia para ficar de olho
O falante usa 19 contrações e formas reduzidas, como don't, we'll, haven't. Diga-as na forma curta, do jeito que você ouve.
- Palavras longas — acerte a sílaba tônica: operator /ˈɑpəˌɹeɪtɚ/, parenthesis /pəˈɹɛn.θə.sɪs/, technically /ˈtɛk.nɪˌkəl.i/
Sons difíceis para falantes de português:
- Consoante final — sem acrescentar um “i” depois: execute /ˈɛksɪˌkjuːt/, skip /skɪp/, subset /ˈsʌbˌsɛt/, prompt /pɹɑmpt/, evaluate /ɪˈvaljʊeɪt/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
- Grave a sua voz e compare com o original, prestando atenção a palavras como execute, skip, operator.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.