过去完成时：sb have/has done sth
过去进行时:sb was/were doing sth
be doing 在过去进行时,现在进行时,将来进行时,一般将来时里...都有
过去：He was watching TV when the murder happened.
现在:-What are you doing now?
-I am cooking.
将来进行:The young men will be waiting for their favourate singer tomorrow.
一般将来:He's going to invite his classmates.
.还有很多.要区分主要看BE动词.（如过去时为was/were）
但是像go,come等一些特殊进行时表示将来就需要去背了.