conj.1. (表示条件)如果He will come if you invite him.如果你请他,他会来的。2. (表示虚拟)假如,要是If I were you, I would never do that.如果我是你,我决不做那件事。3. (表示让步)即使We'll go even if it rains.即使下雨我们也要去。4. 是否I wonder if she is ill.不知她是否病了。5. (表示因果关系)每一次...的时候(总是会)If I feel any doubt, I inquire.我一觉得有疑问就发问。n.1. 条件;设想[C]There are too many ifs in his offer.他的提议中条件太多了。
if+句子,+句子.表示的意思是:如果你...,那么/要不然... 可以等于:祈使句+or/so/and,举例子: Get up early,and you'll catch the early bus. = If you get up early,you will catch the early bus.