(1)join
是指加入某个group、club或者organization或者其他的团体或者协会,强调“个人加入到集体中”;我们还可以说:join up.
例句:She joined a dance company which took her around the world.
她加入了一个舞蹈团,到世界各地去演出。
(2)join in
是指参与某个活动,等于take part in。
例句:He started to sing and I joined in. 他开始唱起歌来,然后我也跟着唱起来。
如果说"与某人一起做某事"、"和……在一起"则用 join sb.in sth./doing sth…
例句:
Would you join me in a walk?
和我一起去散步好吗?
Will you join us in a game of cards?
你愿意和我们一起玩牌吗?