|
一般时
|
进行时
|
完成时
|
完成进行时
|
现在
|
study
studies
|
am studying
is studying
are studying
|
have studied
has studied
|
have been studying
has been studying
|
过去
|
studied
|
was studying
were studying
|
had studied
|
had been studying
|
将来
|
shall study
will study
|
shall be studying
will be studying
|
shall have studied
will have studied
|
shall have been studying
will have been studying
|
过去将来
|
should study
would study
|
should be studying
would be studying
|
should have studied
would have studied
|
should have been studying
would have been studying
|