条件状语从句知识点总结

礻尒装 2个月前 已收到1个回答 举报

夲宮唏 1星

共回答了110个问题采纳率:90.1% 评论

一.if的位置:if“如果”,当引导条件状语从句时,既可以放在主句前面,也可以放在主句后面。若if引导的条件句放在句首,从句后面要加逗号与主句隔开。

例如:My mother will take me to the park if she is free.如果我妈妈有空,她就会带我去公园。

二.时态的运用

注意:在if的条件状语从句中,主句为下列情形之一时,if条件状语要用一般现在时。

1.主句是一般将来时(主将从现)

例如:If he comes, he will tell me all.如果他来了,他会告诉我所有(的事情)。

2.主句是含有情态动词may/might/can/must/should等句子。

例如:If you want to lose weight, you must eat less bread.如果你想减肥,你必须少吃面包。

3.主句是祈使句

例如:If you are not strong enough, please don't take part in such an activity.如果你不够强壮,请不要参加这种活动

条件状语从句可以位于主句前面或后面。

1、 由if,unless引导

if 表示正面的条件,意为“如果”;unless表示反面的条件,意为“除非,如果不”(if not)

You will be late unless you leave immediately.除非你立即走,否则,你会迟到。

If you don't hurry up, you'll be late. 如果你不快点,你就会晚了。

We'll go there unless it rains. 如果不下雨,我们就去那儿。

2、由suppose,supposing,as/so long as, providing, provided, on condition that和in case等引导

这类连词(词组)意思相近,有:“如果、假设、即使、在……条件下”等意义。

Suppose (Supposing) he is ill, what shall we do? 如果他病了,我们该怎么办?

You'll do all right, as long as you follow his advice.只要你听从他的劝告,你就会干得很好的。

In case John comes, please tell him to wait.假如约翰来了,请让他稍候。

You may keep the book a further week provided (that) no one else requires it.倘若这本书没有其他人想借的话,你可以再续借一个礼拜。

7小时前

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