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（过去进行时）
初中英语人教版八年级下册
现在进行时的结构
否定形式
问句形式
am/is/are + not + doing
Am/Is/Are+主语+doing?
am/is/are + doing
He is sleeping now.
He isn’t sleeping now.
Is he sleeping now?
肯定形式
She is swimming now.
She____ swim______ .
was
ming
then
He is reading a newspaper now.
He ____ read____a newspaper
.
was
ing
He ______ read___ a book .
wasn’t
ing
He isn’t reading a book now.
then
then
Are they watching TV now?
Yes, they are.