第1个回答 2019-04-13
情态动词变被动语态结构特征：情态动词+
be
+
动词的过去分词
+
by
+
原句子的主语
如：Young
trees
must
be
watered
often.
Your
mistakes
should
be
corrected
right
now.
The
door
may
be
locked
inside.
Your
homework
can
be
handed
in
tomorrow.
所以，像can
(could),
may
(might),
must,
need,
ought
to,
dare
(dared),
shall
(should),
will
(would)都是这种用法