初中英语句子①为什么用it  ②用to  go  to school  可以吗？为什么？有什么区别？③中的be 是什么意思？①Thta's   isn't  it?②Li  Lei  didn't   go  to  school yesterday,did  he?③I‘ll  be  in town  cext  week  if  you  want  to  meet.

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1.   That's.   Isn't it ?   =  That is。Is not it ?       Is not  必须用缩写 isn't。 因 It is not 不是疑问句子, 若改为疑问句       子时, It 原是主语, 现要放在尾部了。  

2.    Li Lei didn't go to school yesterday, did he ?

        若用 .. didn't to go to school, 这才是错的。因 did not go 的 did 是 do 的过去

         时态, 也是助语词 Auxiliary.  e.g.  I do go so.  我都去啊。  do 是助 go 动词, 而不

         是去助 to go 的 to, 因 to 不是动词 !  区别就是如此。你可说.. didn't run to 

         school..,  但决不能用 didn't to run .. 

3.    I'll be in town next week if you want to meet.       be 是 助语词之一。称为 Verb to be , 包括 : am , is , are , was,        were, been, being 都是此形式及意思。e.g. I am going to town.        or I am loved.   只是 loved 是被动语态 Passive Voice 而己。但        am 巳是做了助动词之功能, am going 或 am loved !        同样, I should be going or loved 也是如此。