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 us?
我们正在吃晚饭,你也来和我们一起吃好吗?
join in多指参加小规模的活动如“球赛、游戏”等,常用于日常口语.如：
①Come along,and join in the ball game.快,来参加球赛.
②Why didn't you join in the talk last night?昨晚你为什么没参加座谈?
3)take part in参加(群众性活动、会议等),往往指参加者持积极态度．起一份作用.如：
①A great number of students took part in May 4 Movement.
大批学生参加了五四运动.
②We are going to have an English evening.Do you want to take part?
我们准备举办一个英语晚会,你想参加吗?
③How many of you are going to take part?
你们多少人准备参加?
④All the students took an active part in the thorough cleaning.
所有的学生都积极参加了大扫除.
【注意】take part in是惯用词组,part前一般不用冠词,但part前有形容词修饰时,要用不定冠词.如：
Lincoln took an active part in polities and was strongly against slavery.
林肯积极参加政治活动,强烈反对奴隶制.
enjoy--get pleasure from;take delight in.
“享受...之乐趣；乐于”.例如：
I've enjoyed talking to you about old times.
我很高兴曾经和你叙旧.
like(vt.vi.)--be fond of;have a taste for;
find satisfactory or agreeable.“喜欢；喜爱；爱好”
例如：Do you like fish?你喜欢鱼吗?
I like to read in bed but I don't like having
meals in bed.
我喜欢躺在床上看书,但我不喜欢在床上吃饭.
at the end of“在……末端（尽头）；在……末（底）”可表示时间,也可表示地点.后面可以跟名词或相当于名词的词.在句中作时间状语,可以放在句子开头,也可以放在句子末尾.
例如：There is a post office at the end of the road.
在路的尽头有一家邮局.
At the end of last week,we had a class meeting.
到上个星期末,我们开了一次班会.
at last=in the end=finally“最后；终于”,后面不接任何单词,在句中作时间状语,一般放在句子开头.
例如：At last/Finally,they won the football match.
他们终于赢了这场足球比赛.
We walked three hours.At last/In the end,we got to the park.
我们走了三个小时.最后我们终于到达了公园.
及物动词 vt.
1.出席,参加
He did not attend the meeting yesterday.
昨天他没有参加会议.
2.上(大学等),前往
The school was attended almost entirely by local children.
上这个学校读书的几乎全是当地的孩子.
3.照料;护理;侍候
There was no one to attend him but Tina.
除了蒂娜,再无人照顾他了.
4.伴随,带有
5.陪同,护送
不及物动词 vi.
1.出席,参加[(+at)]
2.照料,处理[(+to)]
I'll attend to the matter.
我来处理此事.
3.护理;侍候[(+on/upon)]
4.注意,倾听;致力(于)[(+to)]
She didn't attend to what I was saying.
她并不注意听我所说的话.
attend主要用于参加比较重要的场合与会议