关于help用法的问题The wide variety of climates in North America has

非常简单,记住：
help 后面的不定式,一般不带 to,除非宾语太长,以及被动语态
一、正常情况：I helped him stand up.He helps clean the room.We helped wash dishes after dinner.
二、被动语态：He was helped to finish his homework.Mary was helped to stand up.
三、宾语太长：（如果宾语不长：He helps his sister do her homework) He helps his sister who is disabled since childhood to do some exercises every morning.

help sb. do sth
help是真正的谓语，后面的为省略to的不定式

help的用法
help后面能加不定式吗?还是加原形..具体说说
---能的,不定式,原形都行的~

什么时候用不定式或原形?---
help sb. to do sth.
help sb. do sth.
help sb. with sth.
这3个都可以用的啊,意思都一样的.
下面是help的用法--- ...