语法·剖析·活用

条件状语从句

引导词 if，unless，as/so long as，suppose/supposing that，only if，if only，in case，once 例句 If he doesn't come before 12 o'clock，we won't wait for him.

如果他12点前不来，我们就不等他了。

I shall go tomorrow unless it rains.

除非明天下雨，否则我就要走。

So/As long as you keep on trying，you will surely succeed.

只要你继续努力，你就会成功。

Suppose/Supposing（that)I don't have a day off，what shall we do？

假如我们没有一天假，该怎么办？ 注意事项 1)if only 表示条件，常用在虚拟语气的句子中。

If only she were with me.

要是她和我在一起就好了!

2)有时when，since 等引导的从句也具有条件的意味，可以换成if。

When the moon shines bright，he takes a walk in the garden.

每当月明的夜晚，他就在院子里散步。

Since you like the dictionary，why don't you buy it？

你既然喜欢这本字典，为什么不买呢？

当从句主语与主句主语一致，从句中谓语是be或者从句中主语是it，谓语是be的时候，可以将从句中的主语与be一起省略。如：

He won't go there unless (he is)invited.

他不会去那儿除非得到邀请。

I'll come early if (it is)possible.

如果可能的话，我明天早来。 让步状语从句 引导词 though，although，as，even if，even though，whatever/no matter what，whenever/no matter when，wherever/no matter where，whoever/no matter who，whichever/no matter which，however/no matter how，whether 例句 I had a good time although（though，even if，even though)I didn't know anybody at the party.

尽管在这次晚会上我谁也不认识，但我玩得很愉快。

Although he has a lot of money，yet（still)he is unhappy.

他虽然很有钱，但他却不幸福。

I won't go to the party even though I am invited.

即使我被邀请，我也不去参加晚会。

Whatever（No matter what)happens，we shall never lose hope.

无论发生什么，我们都不会失去信心。

Whoever（No matter who)you are，you must obey the school regulations.

不管你是谁，都必须遵守校规。

Wherever（No matter where)you go，I would keep you company.

不管你到哪里，我都会陪伴你。

Whichever book you like on my bookshelf，you may take and read it.

在我的书架上，无论你喜欢哪本书，你都可以拿去读。