have joined是什么时态
have joined是完成时。
joined
v. 加入；参加（join的过去式，过去分词）；[计] 连接
例句
Ive joined an aerobics class.
我参加了有氧健身班。
I joined a dating agency.
我加入了一家婚介所。
They joined the ranks of the jobless.
他们加入了失业大军。
He joined the society for political ends.
他为了政治目的加入了这个协会。
Their son ran away from home and joined a cult.
他们的儿子离家出走，加入了一个异教团体。