否定式
may not
might
not
cannotcan not
could
not
must not
do not
have to
ought
not to
will not
would
not
shall
not
should
not
need not
dare not
used not
to
did not
use to
简略否定式
mayn't（老式英语，现在不常见）
mightn't
can't
couldn't
mustn't
don't
have to
oughtn't
to（否定句中to可省略）
won't
wouldn't
shan't（只用于英国英语）
shouldn't
needn't
daren't
usedn't
to
didn't
use to
B．情态动词除ought
to, used to等外，后面只接不带to的不定式。
1．情态动词+do
You
shouldn't be so careless.你不该这样粗心大意。
Jessica
told him yesterday she might not go on the trip.
杰西卡昨天告诉他，她可能不去旅行了。
Difficulties can and must be overcome.
困难能够而且必须克服。
2．情态动词+be
doing
She must
be listening to pop music.
她肯定在听流行音乐。
You
should be reviewing your lessons.
你应该在复习功课。
My
mother maymight be cooking now.
我妈妈可能正在做饭。
3．情态动词+have
done
They
might have visited the Great Wall.
他们可能参观过长城了。
He must
have got up very early to catch the train.
他一定起得很早去赶火车了。
You
ought to have come earlier.
你本该早一点儿来。
4．情态动词+be
done
This
word can also be used as a verb.
这个词也可以用作动词。
Something must be done to stop pollution.
必须采取措施来制止污染。
The work
ought to have been finished long ago.
这工作早就该完成了。
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