情态动词与虚拟语气
一、知识储备
1．情态动词全家福
|
现在式
|
can
|
may
|
must
|
shall
|
will
|
|
过去式
|
could
|
might
|
--------
|
should
|
would
|
|
情态动词短语
|
be able to
|
be allowed to
|
have (got) to
|
ought to
|
be going to
|
2。情态动词用法
1. 独特用法
• 2. 推测用法
• 3. 虚拟用法
（1）基本用法
能力Can:（现在能力、过去能力、将来能力）
理论上可能Can:（只适用于肯定句中，不宜用于否定句中）
许可：肯定许可may, might, can, could,但是多用can或者be allowed to do
否定许可may not, might not, can’t, mustn’t
建议和忠告：建议could, Shall I? Shall we? may(just) as well, might (just ) as well
忠告 should, ought to, had better
意图、意愿。执意will
请求Will you---? May I---? Could/ can I---? Could/ can you---?
