happen等于什么?

happen等于什么? What happen作主语可以等于什么? how come(happen)什么意 Happen可以有什么时态 happen on 和 happen to 有什么区别正确. happen to do sth什么意思 what happens will happen!什么意思 happens与happen有什么区别 what happen后面要加什么词? 请问occur 和happen有什么区别 happen,happens,happening有什么不同? 英语单词：happen与occur有什么区别? what has happen 和what was happen 和what happen有什么区别,它们后面都能加to吗? HAPPEN ON ...这个短语 和sth happen to sb什么区别? some groups of people just happen to be fatter than others.happen to be什么结构 where happens something?Where does something happen?有什么区别 take place与happen有什么区别?还有be held take place,happen有什么区别懂英语的进来