[高中]全新语法:条件状语从句 二、only if和if only的区别

二、only if和if only的区别

1.only if

（1）only if中，only是副词修饰if，意为“只有……（才）”。

I will come home only if you come with me.除非你跟我一起走，我才回家。

I told him he would succeed only if he tried hard.我告诉他，只有努力才能成功。

（2）only if 可用作“only ...if ...”表示唯一的条件。

I will only come home if you come with me.除非你跟我一起走，我才回家。

The sale will only go ahead if the serial numbers match.

只有序号相符时，销售才能继续进行。

（3）only if置于句首时，主句用倒装语序。

Only if I get a job will I have enough money to go to school.

我只有找到工作才有足够的钱上学。

Only if we have enough money will we visit Europe next year.

只要有钱，明年我们就去欧洲。

2.if only引导虚拟语气，表达强烈的愿望，意为“要是……就好了”。

If only they had attended our wedding anniversary.

要是他们参加我们的结婚纪念日就好了。（与过去事实相反）

If only I were as clever as you！ 要是我像你一样聪明该多好啊！（与现在事实相反）

If she would only come！ 但愿她能来。（与将来事实相反）