第1个回答 2019-09-13
1.含有be动词的句子,在改否定句时,需要在be动词后加not,缩写形式为(isn't
aren't
am和not没有缩写
)
He
is
a
boy.----
He
isn't
a
boy.
2.含有助动词(do,does,did)的句子,
在改否定句时,需要在助动词后加not,缩写形式为(don't
doesn't
didn't);注意用到dose或did时,原句中的实意动词要还原。
I
play
football.----
I
don't
play
football.
He
plays
football.----
He
doesn't
play
football.
He
played
football
yesterday.----
He
didn't
play
football.
3.
含有情态动词(can,
may,
must)的句子,
在改否定句时,需要在情态动词动词后加not,缩写形式为(can't
mustn't).
I
can
play
football.----
I
can't
play
football.
希望可以帮到你!