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现在进行时
am/is/are + doing
过去进行时was/were + doing
现在分词的四般变化：
1.一般直接加: going/walking/working
2.见e（不发音）： taking/writing/arguing
3.重读辅元辅双尾:swimming/cutting/putting
4.ie结尾变为y: lying/dying/tying
回顾现在进行时的两大用法：
① 表示此时此刻正进行；②表示现阶段在进行。标志词：
now/right now/at this moment/look/listen
过去进行时的构成、用法和时间状语
When和while的区别
1. I was watching TV at this time of yesterday.
2. My parents were walking from nine to ten
last night.
3. I was listening to music the whole morning.
常见时间状语：
at 3 o’clock yesterday afternoon, in those days,
at that time ,at this time yesterday等。
问题引导下再学习
过去进行时表示过去某一时刻或过去某一时段正在进行的动作。
the thief came in， I was sleeping.
The thief came in， I was sleeping.
The thief came in， I was sleeping.
过去进行时两大掌门人: when和while
When
when
while
When 后可长亦可短，while之后只可长。