情态取向

显性主观

隐性主观

隐性客观

显性客观

可能性

I think she knows.

She will know.

She probably knows.

It is likely that she knows.

经常性

He will sit quiet.

He usually sits quiet.

It is usual for him to sit quiet.

义务

I want him to go.

He should go.

He is supposed to go.

It is expected that he goes.

意愿

Jane will help.

Jane is keen to help.