eg.1)I'll tell her the good news _____he comes back.
2)Aunt Wang came in while we were watching TV
3)since:自从以来(since从句常用一般过去时)
注意主句通常用现在完成时,但当主句表示一种状态,用一般现在时
eg.1)He has lived there since he came to China
2)It is two years since her mother died.
(二)条件状语从句:由if (如果)引导的从句
eg.I will go to the park if it ________ (not rain) tomorrow.
注意:条件状语从句与以下句型的转换
1)祈使句,and (then , or)+简单句
= If you , you
eg.1)Use your head, then you'll find a way.
=If you use your head, you'll find a way
2)Hurry up, or you'll be late.
=If you don't hurry, you'll be late.
2)without与条件句的转化
eg. Man can't live without water.
=Man can't live if there is no water.
注意以上两种状语从句的时态
主句 时间、条件句
1)一般将来时 2)祈使句 3)情态动词原形 一般现在时
一般过去时 一般过去时
但since从句例外,应与现在完成时连用。
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