if 引导的条件状语从句
用来询问或谈论十分可能的事情,在这些条件句中,if从句用现在时,主句用将来时(will) -----主将从现
eg :If i have time , i will call you tomorrow.
if he is working, i won't disturb him.
注意:if 表如果时符合主将从现
if 表是否还用将来时
eg: I don't know if it will rain tomorrow. if it rains , i will stay home.
我不知道明天是否下雨,如果下雨我就在家呆着。 |