to help...为什么要用介词to?

to help...为什么要用介词to? 为什么who do you write to要用介词to? can't help to to是不是介词?为什么to后面是原型? Is there any robots to help us study?中为什么要用to help? Little by little I have found my neighbor___great help to my work.这里需要填个介词,用什么,为什么? trip后的介词为什么要用to What are you going to do to help these homeless people这里为什么要用to help Help make it a special day英语语法错误help 和make 都是动词 ,为什么不加入介词 就可以直接用呢?我认为,应该是 help making 或者是 help to make 都好吧, 为什么close to home要加介词to they keep their secrets to themselves为什么用介词“to” It is important to us为什么用介词to We must do what I can to help him这里为什么要用to help to help him是不是作定语?do what I 怎么分清 介词短语 和 短语 to help pay 是介词短语吗 如果是 那不就是要用 paying 为什么agree to 的to 是介词? She asked her cousin to help her.为什么用 to 英语语法 he was to help weed out the bad oneshelp为什么可以和weed out 连一块?to help 当介词短语了? help通常与什么介词搭配,还要help to do ,还是help doing? 用适当的介词填空,快It’s very nice_____you to help us.