2.What do you think happening to him?I haven't seen him for days.该错
问题描述：
2.What do you think happening to him?I haven't seen him for days.
该错
答
What do you think have happened to him ?
答
happen.不能用进行时。除非口语。。上层貌似改的有点靠谱
答
What do you think has happened to him ? 这个句子的成分是这样的：do you think/consider是插入语，应该提前的
就是：Do you think what has happened to him?
what has happened to him整个作think的宾语。因此happening形式有误。
答
What do you think is happening to him?
答
翻译：你觉得他发生了什么事情?我有好几天没见过他了.
改正：What do you think is happening to him ? I haven't seen him for days.
前半句是“What is happening to him?”嵌套入“do you think”的用法.