引導條件狀語從句的從屬連詞用法歸納

■if 的用法。其意為“如果”

He抣l do it if you pay him. 如果你付錢，他是會干的。

If you ask him, he will help you. 如果你向他提出請求，他會幫助你。

■unless 的用法。其意為“如果不”、“除非”

I shall go there tomorrow unless I’m too busy. 如果我不太忙，明天將到那兒去。

Unless you go at once you will be late. 如果你不馬上走，就會遲到的。

■as [so] long as 的用法。其意為“如果”、“只要”

As long as you do your best, we抣l be happy. 只要你盡力，我們就滿意了。

You can go out as long as you promise to be back before 8. 如果你保證八點以前回來，你可以出去。