文档介绍:Grammar
情态动词
:能够;会
:可能(客观的可能性)
:可以
can
:
1. can but do sth:只好做...
2. can`t help but do.../
can`t help doing...忍不住做...
3. cannot be/do ... too...
can never be/do... too...
再...也不为过;越...越好
can
:能够;会
:可能性比can弱。
:可以(委婉请求或建议)Could I do... /Could you(please) do...?
:
could
:可以(比can更委婉)
:可能性很小,比can弱
can表客观可能性,may表主观猜
测的可能性。
3. 否定猜测:can`t 可能性很大,而
may not 可能很小,不确定。
may
:必须;应该;有否定结构
干嘛偏要,非要
:"肯定",可能性很大,其否
定式常用can`t
must
3. MustI/we...? Yes, you must./
No, you needn`t/don`t have to.
:
must
He must be watching TV, ?
isn`t he
It mustn`t have rained last night, ?
didn`t it
It mustn`t have rained , ?
did it/
have it
:多用于一人称Shall I/we
;决定;承诺;警告;规定
等:多用于二,三人称
shall
1. 义务;责任等:应该;应当
2. 推测:照理说;按说应该
3. 表责备:本应该做...而未做...
should/ought to have done/
本不应该做...而做了...
should not /ought not to have done
;遗憾:竟然;居然
should/ought to
1. 表意愿;决心:愿;会
2. 表请求:
Will you/Would you (please)do...?
3. 倾向性,必然性****惯性:
will/would