新概念第一册语法轻松学：过去时
过去完成时：用法：在过去的时间里，两个动作中，发生在前的哪个动作要用过去完成时。
结构：had+过去分词
After she had finished her homework, she went shopping.
They had sold the car before I asked the price.
The train had left before I arrived at the station.
After/before引导的时间状语从句放在句首要在句子后面加逗号，如果放在主句后则不用加。
★ 变疑问句将助动词移到句首
Had she finished her homework?
★ 变否定句在助动词后面加not
She hadn’t finished her homework.
★ 肯定回答及否定回答
Yes, she had. No, she hadn’t.
★ 特殊疑问句：
What had she done?
过去进行时
表示过去正在进行的动作,经常用在when, while, as引导的状语从句中。
结构：was/were+doing
When my husband was going into the dining room this morning, he dropped
some coins on the floor.
While we were having dinner, my father was watching TV.
过去将来时
结构：would do
She said she would go here the next morning.
（兼职编辑：张博）
页:
[1]