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九年级上册《Unit 4 Growing up Grammar_ Using before, after, when and while & Using since, till and until ＆ Using as soon as and whenever 》名师优质课ppt课件
I went to school after I finished my breakfast.
我吃完早饭去上学。
You should turn off the lights _________ you leave the room.
= You should turn off the lights _____________ the room.
2. Tom went to school ________ he finished his breakfast. = ______________ his breakfast.
3. Time passed quickly and three months went by __________ I knew it.
4. The sun came out ________ the storm stopped.
Fill in the blanks with “before” or “after”.
before
before leaving
after
after finishing
before
after
before/ after + 句子或doing形式
when意思是“当…时”，表示主句动作发生的特定时间。如：
While my sister was sweeping the floor, I was washing the dishes.
我姐姐扫地时，我在洗碗。
while意思是“与…同时”，强调主句动作和从句动作是同时发生的。如：
The days get longer when spring comes.
春天到来时，白天变长了。
注意：while引导的从句的谓语动词必须是延续性的。
while还可以表示“在…期间”，表示主句动作发生在从句动作进行的过程中。如:
While the boys were playing football, it rained.
当男孩子们踢足球时，下雨了。