1. take part in 指参加会议或群众性活动等，着重说明句子主语参加该项活动并在活动中发挥作用。如：①We'll take part in social practice during the summer vacation.暑假期间我们将参加社会实践。②We often take part in physical labour. 我们经常参加体力劳动。【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：①Lincoln 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。2. attend是正式用语，及物动词，指参加会议，婚礼，葬礼，典礼；去上课，上学，听报告等。句子的主语只是去听，去看，自己不一定起积极作用。如：①He'll attend an important meeting tomorrow.他明天要参加一个重要的会议。②I attended his lecture. 我听了他的讲课。
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。 attend是正式用语，及物动词，指参加会议，婚礼，葬礼，典礼；去上课，上学，听报告等。句子的主语只是去听，去看，自己不一定起积极作用。如：①He'll attend an important meeting tomorrow.他明天要参加一个重要的会议。②I attended his lecture. 我听了他的讲课。故应选attend.参考资料：爱问知识人本回答被提问者采纳
