happen和appear的区别
happen有意外发⽣的意思，相当于汉语中的“碰巧发⽣”，例句：I don't know what happened.我不知道发⽣了什么（碰巧）。appear的意思就是“出现；显现”，没有什么特别的强调碰巧，就是正常使⽤就⾏了。
happen的相关例句
All the changes happened over a period of time.
所有这些变化都是在⼀段时间内发⽣的。
You must on no condition tell them what happened.
你决不能告诉他们所发⽣的事。
This is the cond time it's happened.
这已是第⼆次了。
You don't happen to know his name, do you?
你不会碰巧知道他的名字吧？
He gave me a guarantee that it would never happen again.
他向我保证这种事情绝不会再发⽣。
appear的相关例句
This problem first appeared in the inner cities.
这个问题最初在市区中⼼出现。
Your name will appear at the front of the book.
你的名字将出现在书的前页。
It would appear that this was a major problem.
看来这是个主要问题。
The magazine will appear in a new design from next month.
从下⽉起这本杂志将以新的设计问世。
The president appears likely to change cour on some key issues.
总统看起来可能要在某些重要问题上改变⽅针。
