Question

英语中的肯定句变否定句的规则是什么

Answer 1

有be动词的在其后加not,其余一般现在时在动词前加don't(第三人称单数用doesn't），如果句中有some一般还要改成any．

Answer 2

1.在一般现在时和一般过去时中，1)在be后加not。
he
is
here.否定：he
isn't
here
they
were
very
happy.否定：they
weren't
very
happy
如动词是其它的实意动词：
2)如是动词原形则在前加助动词do
再加not；
they
do
sports
every
day.
(do在这里是“做”的意思，是实意动词，不能直接加not否定)
否定：they
don't
do
sports
every
day.
3）动词是第三人称单数则在前加助动词does
再加not；
，且单三还原成原形
he
gets
up
at
six.
否定：he
doesn't
get
up
at
six
4)动词是过去式，则在前加助动词did再加not；
we
visited
the
old
man
yesterday.
否定：we
didn't
visit
the
old
man
yesterday.
2.如果谓语动词是情态动词，则在情态动词后加not。情态动词也是一种助动词
we
can
dance
very
well.
否定：we
can't
dance
very
well
3.如果谓语动词是其它时态，则在第一个助动词后加not
they
are
working
hard.(be
dong
中的be帮助构成了时态，是助动词)
否定：they
are
not
working
hard.
he
has
finished
his
homework.
(have
done
中的have帮助构成了时态，也是助动词)
否定：he
has
not
finished
his
homework.
4.使用no,
hardly,
seldom,
never,
nobody,
few,
little
等否定词
nobody
is
in
the
room.=there
is
not
anybody
in
the
room.