题目内容：

英语语法改错改错高手请进
1,The university for the aged offers courses of computer ,music,English and so on.
2, You are cordially invited to a party being given at our institute at 1;30 p.m this Sunday.
3,Computers have came to be widely used in Chinese families.
以上几个改错题,麻烦高手指出错误并解释下原因
不要仅仅列出一个答案哦