take part in join join in三者辨析

join,指加入某种组织、团体，成为其中一员，如：
join the party ,league, the army,
,join in
join in指参加某中非正式的活动：

Will you join in the talk?
Will you join us in a walk?

take part in指参加正式活动、集会，不是旁观者，而是积极投入其中：
I took part in the Winter sports in our school.
Do you take an avtive part in the class activities?

oh，hoho，你发错区了，不过还是帮你帖一下
解答： join,?join in和take part in
1)加入某党派、某组织或某社会团体，用join，不可用join in。如：
①He will never forget the day when he joined the Party.
他永远也忘不了他入党的那一天。
②His brother joined the army three years ago.
他哥哥是三年前参军的。
join还可解释为“连接”。如：
①The railway joined the two cities.
铁路把两个城市连接起来了。
②The two clauses are joined by a conjunction.
两个分句由一个连词连接起来。

2)说参加某种活动用join in，如说“与其人一起做某事”，则用join sb. in sth. / doing sth. 。如：
①May I join in the game? 我可以参加这个游戏吗？
②Come and join us in the discussion. 来和我们一起讨论吧！
③We are having supper now.?Would you like to join