come over:
v. 过来
例句与用法:
Why don't you come over to England for a holiday?
你怎麽不到英国来度假呢?
come on:
v. 突然产生, 要求, 成为...负担, 偶遇, 跟着来, 开始, 出台, 上演
快点,赶快
例句与用法:
1. His French has come on a lot since he joined the conversation class.
他自从参加了会话班,法语取得了很大进步。
2. I came upon a group of children playing in the street.
我遇到一群孩子在街上玩耍.
3. The garden is coming on nicely.
这个花园里花草茂盛.
4. Her baby is coming on well.
她的婴儿发育良好.
参考资料:http://zhidao.baidu.com/question/13179628.html?fr=ala0