英语的否定句和肯定句怎么写？

一.肯定句变成否定句
如果句中有be动词is,am,are
或情态动词must,can等,在其后面直接加not,
she
is
your
mother.
she
isn't
your
mother
2.如果没有be动词或情态动词,加don't,does't或did't
she
likes
playing
football.
she
doesn't
like
playing
football.
二.肯定句变成疑问句
变成一般疑问句
如果有be或情态动词动词就把他们提前,
she
is
your
mother.
is
she
your
mother?
2.如果没有就在前面加do的某种形式,第三人称用does,过去时用did
she
likes
playing
football.
does
she
like
playing
football?
变成特殊疑问句,
要具体分析,看是对什么进行提问,简单来说,
1.对人提问用who,
she
is
your
sister.who
is
your
sister?
2.对事物用what,
the
book
is
on
the
desk.
what
it
is
on
the
desk?
3对时间用when,
she
will
come
back
tomorrow.
when
she
will
come
back?
4.对频率用how
often等等
i
play
football
everyday.
how
often
does
you
play
footall?

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