第二条件句

第二条件句：if + 一般过去时，would + 动词原形。这里的过去时并不表示过去的时间——它表示这种情况不真实或不太可能，指的是现在或将来。

两个分句可以调换位置；if 从句在前时，通常加逗号。'd = would（I'd、she'd、we'd）。简略回答：Would you move abroad if you could? —— Yes, I would. / No, I wouldn't. 主句里可以用 could（= would be able to，能够）或 might（= would perhaps，也许会）代替 would；if 从句里也可以用 could（= if I were able to，如果我能）。

• If I had a car, I could drive you home.

  如果我有车，就能开车送你回家。（could = would be able to，能够）

• If we left now, we might catch the last train.

  如果我们现在出发，也许还能赶上末班火车。（might = would perhaps，也许会）

• If I could live anywhere, I'd choose Da Lat.

  如果我可以住在任何地方，我会选择大叻。

💡中文说假设时动词不变形，“如果我有钱，我就……”和讲真实情况的说法一样，所以学习者常常保留现在时：“If I have money, I would…”。快速检查：结果部分有 would，if 从句就要退回过去时（have → had，can → could，am/is → were）。

1. 与现在事实相反的情况——事实并非如此

• If I knew her number, I'd call her.

  如果我知道她的电话号码，我就给她打电话了。（但我不知道）

• We would visit you more often if we didn't live so far away.

  要是我们住得没那么远，就会常来看你们了。（但我们住得很远）

2. 想象现在或将来——不太可能或不可能发生的“假如……”

• What would you do if you lost your job tomorrow?

  如果你明天丢了工作，你会怎么办？

• If animals could talk, my cat would complain all day.

  要是动物会说话，我的猫肯定会抱怨一整天。

3. 提建议：If I were you, I'd…——设身处地站在对方的立场

• If I were you, I'd talk to her before you decide.

  如果我是你，我会在做决定之前先跟她谈谈。

• I wouldn't sign that contract if I were you.

  如果我是你，我就不会签那份合同。

4. 更委婉的请求和征求许可——用过去时显得更温和、更礼貌

• It would be great if you could send it by Friday.

  如果你能在星期五之前发过来就太好了。

• Would you mind if I opened the window?

  我开一下窗你介意吗？

be 动词在 if 从句里对所有人称都可以用 were：if I were、if she were、if it were。口语中，I / he / she / it 后面用 was 也很常见，可以接受；were 更正式，写作和考试中用它最保险。表示建议的 If I were you 几乎总是用 were。

• If she were here, she'd know what to do.

  如果她在这里，她会知道该怎么办。

• If it was a bit cheaper, I'd buy it.

  要是再便宜一点，我就买了。（非正式；更正式的说法：if it were）

两种正式的变体：if … were to + 动词 强调某事极不可能发生；倒装则省略 if：Were I… = If I were…（见“倒装”一课）。

• If the factory were to close, hundreds of people would lose their jobs.

  万一工厂关闭，数百人将会失业。（正式）

• Were I in your position, I would accept the offer.

  如果我处在你的位置，我会接受这个提议。（非常正式）

两者都谈现在或将来。区别在于说话人怎么看待这个情况：真实的可能性 → 第一条件句；只是想象、不太可能或与事实相反 → 第二条件句。见“条件句”一课。

• If I get the job, I'll buy a motorbike.

  如果我得到这份工作，我就买一辆摩托车。（真实的可能性——我在等结果）

• If I got the job, I'd buy a motorbike.

  要是我得到这份工作，我就买一辆摩托车。（我其实不太指望能得到）

• If it rains tomorrow, we'll stay at home.

  如果明天下雨，我们就待在家里。（很有可能）

• If it snowed in Ho Chi Minh City, everyone would go crazy.

  要是胡志明市下雪，大家都会疯掉的。（几乎不可能）

💡不要混用两种句型：if + 现在时 搭配 will，if + 过去时 搭配 would。“If I had wings, I will fly” 和 “If I have time, I would help” 都是错的。

• ✗If I would have more money, I would buy a laptop.

  ✓If I had more money, I would buy a laptop.

  if 从句用一般过去时；would 放在结果部分。

• ✗If I had wings, I will fly to school.

  ✓If I had wings, I would fly to school.

  过去时的 if 从句搭配 would，不用 will。

• ✗If I am you, I would apologise.

  ✓If I were you, I'd apologise.

  提建议用 If I were you。

• ✗He's not good at English. If he speaks better, he would get the job.

  ✓He's not good at English. If he spoke better, he would get the job.

  与现在事实相反 → if 从句用过去时。

• ✗If I knew her number, I would called her.

  ✓If I knew her number, I would call her.

  would + 动词原形。

• ✗What you would do if you won?

  ✓What would you do if you won?

  疑问句中 would 放在主语前面。