一个英语句子（语法）求解Thingshavetobeputinorderherebeforetheycome.在他们来之前,东西必须都收拾好.这句话为什么是beput?是不是被动语态还是什么?另外,有能力者请多回答一条：用简短的几

Question

一个英语句子（语法）求解
Things have to be put in order here before they come.
在他们来之前,东西必须都收拾好.
这句话为什么是be put?是不是被动语态还是什么?
另外,有能力者请多回答一条：用简短的几句话介绍、说明一下虚拟语气.

Answer 1

have to是..不得不..be put是被动语态虚拟语气有三种1 与过去事实相反--主句用should would+have done 从句用had+doneif he had known it,he would have told me2 与现在事实相反--主语用would should could might+...