现在进行时怎样变否定

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现在进行时怎样变否定现在进行时怎样变否定现在进行时怎样变否定现在进行时的结构是:动词BE(AM/IS/ARE)+动词ING形式,所以其的否定形式是直接在BE后加NOT,如:Heisdoinghisho

现在进行时怎样变否定
现在进行时怎样变否定

现在进行时怎样变否定
现在进行时的结构是:动词BE(AM/ IS / ARE )+动词ING 形式,所以其的否定形式是直接在BE后加NOT,如:
He is doing his homework -> He isn't doing his homework.

not doing

现在进行时的结构是:动词BE(AM/ IS / ARE )+动词ING 形式,所以其的否定形式是直接在BE后加NOT,如:
I'm playing football. -> I'm not playing football .
He is doing his homework -> He isn't doing his homework.
they're playing football. -> they aren't playing football .