join in/join

join是指“参加某个组织”“参加到某个人群中”，而成为其中的一员。例如：

join the army (the party, the team, the club, sb.) 参军(入党、入队、参加俱乐部、和某人一起活动)

1. She joined a health club. 她参加了一个健身俱乐部。

2. At the age of eight, he joined a group of child dancers, ... 他八岁就参加了一个儿童舞蹈队，……

3. We both joined the Labour Party... 我们俩都加入了工党……

4. Another reason for my joining the air force is the chance for special training. 我参加空军的另一个理由是有机会进行特殊的训练。

5. May I join you? 我可以跟你(你们)一起(活动)吗?

6. You are welcome to join us. 欢迎你加入到我们当中来。

而 join in 后跟的宾语一般是表示竞赛、娱乐、游戏等活动的名词：

1. He would not join in the game. 他不愿参加这个游戏。

2. Can I join in the game? 我可以参加这个游戏吗？

3. Then a girl clerk joined in the discussion. 后来有一位女职员参加了讨论。

4. After that more and more countries joined in the games. 后来越来越多的国家参加了奥林匹克运动会。

5. May I join in your conversation? 我可以加入你们的谈话吗？

6. This is an exciting game in which the whole family can join. 这是一种可以由全家人共同参加的激动人心的游戏。

注意, join in 中的 in 有时候可用作副词:

We are playing football. Do you want to join in? 我们在踢足球。你想参加吗？上面的两个结构可以合二为一：join sb. in (doing) sth:

1. She joined the girls in a walk. 她跟姑娘们一起去散步了。

2. Do join me in a swim? 和我一块去游泳吗？

3. They joined him in a visit to London. 他们跟他一起参观了伦敦。