第四章 情态动词（一）
情态动词表示说话人对动作或状态的各种观点和态度，如需要、猜测、意愿或怀疑等。情态动词有词义，但不完全，是所谓的“辅助性”动词，在句中不能单独充当谓语。
一、 情态动词的特征和形式
A.情态动词的各种形式见下表：
情态动词
may
might
can
could
must
have to
ought to
will
would
shall
should
need
dare
used to
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
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