下司犬幼崽怎么喂养:what has happen 和what was happen 和what happen有什么区别，它们后面都能加to吗？

来源：百度文库 编辑：高考问答 时间：2024/04/25 13:09:53
？？？

前两个句子都是错的！
1.what has happened 完成时态
2.what was happening 过去进行时态
第三个通常也应该说：what happened/happens 一般过去或者一般现在时态
都可以加to
三者只是时态不同，用法都一样。

别听他们的 happen和take place是没有被动语态的。只有what had happened和what happen

what was happened 后面不能加to

what has happen 和what was happen 和what happen有什么区别，它们后面都能加to吗？ what's happen ? what will these things happen ? "What happen" is incorrect? what has the head what has happened?是什么意思 为什么用HAS 怎么样分别MP3和WHA的格式呀? Experience is not what happen to you, it is what you do to what happen to you. happen on 和 happen to 有什么区别 What table has no leg?