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在动词后加not
2、动词为实意动词：
在动词前加don’t(动词原形）、doesn’t（动词单三形式）、didn’t（动词过去式）其中的一个，原来的动词变成原型。
3、句中有some的要换成any
实例示范
I a teacher. （改否定句）
I a teacher.
There books on the desk.（改否定句）
There books on the desk.
He his homework yesterday. （改否定句）
He his homework yesterday.
I an English song. （改否定句）
I sing an English song.
am
am not
are
are not
any
did
didn’t do
can
can’t(can not)
some
sing
牛刀小试
There is an apple on the desk.(改否定句)
I will go to school at seven.(改否定句)
He plays ping-pong everyday.(改否定句)
Go to school at seven.(改否定句)
Don’t go to school at seven.