否定句形式是:主语+be(am, is, are)+not+动词的现在分词+其他。Not可以和be动词缩写。例如:
① Im not writing. Im reading now. 我现在没写,我正在读书。
② They arent cleaning the classroom. 他们没在打扫教室。
疑问句形式是:Be(Am, As, Are)+主语+现在分词+其他?
肯定回答用Yes,主语+be。否定回答用No,主语+be动词的否定形式。例如:
① --- Are you writing a letter now?
--- Yes, I am. / No, Im not.
--- 你在写信吗?
--- 是的,我在写。 /不,我没写。
② --- Is Lily watching TV?
---- No, she isnt. She is doing her homework.
--- 莉莉在看电视吗?
--- 不,她没看。她在做家庭作业。
③ ---- Are the children playing football?
--- Yes, they are. /No, they arent.
--- 孩子们正在踢足球吗?
--- 是的,他们在踢。/不,他们没在踢。
特殊疑问句形式是:特殊疑问词+be+主语+现在分词+其他?回答时,不用Yes, 或No,须作具体回答。例如:
① --- What are they doing?
--- They are swimming.
--- 他们在做什么?
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