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---1. 过去进行时的结构
—2.过去进行时态的标志词。
—3.when和while在句中的用法-
—4.中考链接
—5.知识点小结 --- 过去进行时的用法一．给出学生午睡的照片，来引出现在进行时态，齐唱Are You Sleeping?并找出现在进行时态的句子。
英语现在进行时态复习
Exercises:
Are you sleeping？（变过去时态）
____ you sleeping?
Morning bells are ringing.（变过去时态）
Morning bells ____ ringing.
He is playing basketball.
He ____ playing basketball.
结论:
现在进行时态结构：am/is/are+doing
变过去时态：was/were +doing
二.定义
现在进行时
定义：现在进行时表示现在或现阶段正在进行时的动作。
过去进行时
定义: 过去进行时常表示过去某一时刻或过去某一阶段内正在进行的动作。
What were they doing at this time yesterday?
They_____ ______ (sing)at this time yesterday.
What were they doing at that time yesterday?
They_____ ______ (read)at that time yesterday.
What was he doing at 8:00 yesterday?
He_____ ______(write)at 8:00 yesterday.
What was she doing the whole day?
She_____ ______(ski)the whole day.
三．观察下面的句子，注意时间的变化。