1. 从句的动作和主句动作同时发生,意为“当……时;在……的时候”,例如:
he liked playing basketball when he was young. 他年轻的时候,就喜欢打篮球。
2. 从句的动作发生在主句动作之前,例如:
when you get there, please tell lucy to call me back. 你到那后,请告诉露西给我回电话。
come here to find me when you finish you homework.你做完作业后,来这儿找我。
3. 我们也可用after, before, until等连词引导时间状语从句。如:
after simon does his homework, he listens to music.西蒙做完家庭作业后,他就去听音乐。
before mary went to bed, she drank some milk. 玛丽在睡觉之前,喝了些牛奶。
注意:当主句是将来时的时候,从句要用一般现在时。
— i want to know when mr. brown will arrive. — when he ______, i will tell you.
a. will arrive b. arrived c. arrives d. arrive
【used to的用法】
used to意为“曾经;以前”,用来谈论过去常常做某事。其句型的变化形式如下:
句型变化 used to
陈述句 (主语+ used to do) lily used to learn to play the piano at school.
莉莉曾经在学校里学习弹钢琴。
否定句 (主语+ did not + use to do) lily didn't use to learn to play the piano at school.
莉莉以前没有在学校学习过弹钢琴。
一般疑问句 (did+主语+use to do) did lily use to learn to play the piano at school?
莉莉曾经在学校学习过弹钢琴吗?
特殊疑问句 (what + did+主语+use to do) what did lily use to do at school?
莉莉以前在学校干什么?
拓展:
be used to doing sth. 习惯于做某事 be used to do sth. 被用来做某事 (表示被动)
eg: she is used to taking a walk after dinner. 她习惯晚饭后散步。
knives are used to cut things. 刀被用来切东西。