if引导的条件状语从句有哪几种类型？

Question

如题所述

Answer 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 leaveimmediately.除非你立即走，否则，你会迟到。
If you don't hurry up, you'llbe 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, whatshall we do? 如果他病了，我们该怎么办？
You'll do allright, aslong 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, pleasetell him to wait.假如约翰来了，请让他稍候。
You may keep thebook 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。