c.用来陈述原因或用作借口
She went
to the doctor yesterday. She was having a lot of trouble with her heart.
她昨天去看病了。她患了很严重的心脏病。
I
haven't finished my homework because I was helping my mother at home all day
yesterday.
我作业没做完是因为我昨天一直帮妈妈在家干活。
d.与always,
constantly等词连用，表示感情色彩
The girl
was always changing her mind.
这女孩老是改变主意。
In the
past he was constantly asking me for money.
过去他总是向我要钱。
3．过去进行时与一般过去时的区别
①一般过去时往往表示某一动作已经完成，而过去进行时却表示动作在持续或未完成。
She
wrote a letter to her friend last night.
她昨晚给朋友写了封信。（信写完了）
She was
writing a letter to her friend last night.
她昨晚一直在给朋友写信。（信不一定写完）
②一般过去时表示只做一次动作，而过去进行时却表示动作反复地进行。
She
waved to me.
她朝我挥了挥手。
She was
waving to me.
她不断地朝我挥手。
The boy
jumped up and down.
这男孩跳了一下。
The boy
was jumping up and down.
这男孩不停地跳着。
C.将来进行时
1．将来进行时的构成
将来进行时是由“shall/will + be +现在分词”构成的。
Don't
phone me between 8:00 and 10:00. We'll be having classes then.
8点到10点之间不要给我打电话，我们那时正在上课。
Will you
be using your bicycle this evening?
今晚你用自行车吗？
She
won't be having a meeting in her office at 8:00 tomorrow.
明天8点她不在开会。
2．将来进行时的用法
①将来进行时的基本用法
a.表示在将来某一时间正在进行的动作
I'll
be taking my holiday soon.
我不久就去度假了。
They
will be meeting us at the station.
他们会在车站接我们的。
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