中老年人补钙吃什么牌子的钙片好:情态助动词都有哪些?
来源:百度文库 编辑:杭州交通信息网 时间:2024/07/04 03:39:45
再补充一些被大家忽视的: have to,will,would
can
may
might
could
should
must
ought to
need
can
may
might
could
should
must
can
may
might
could
should
must
ought to
need
must\can\may and so on