lead sb to do 还是lead sb do,它是不是等于cause sb to do sth ？ help sb do还是help sb to do?,希望老师解答，谢谢!

(1)vt促使；使得；使lead sb to do sth

His abhorrence of racism led him to write The Algiers Motel Incident. 

对种族主义的憎恨促使他写了《阿尔及尔汽车旅馆事件》一书。

What was it ultimately that led you to leave Sarajevo for Zagreb?  

最终是什么让你离开萨拉热窝前往萨格勒布的？

(2)vt诱使；误导 lead sb to do sth=cause sb to do sth

Mother had led me to believe the new baby was a kind of present for me. 

母亲让我相信新出生的宝宝是给我的一个礼物。

It was not as straightforward as we were led to believe.  

这事并非如我们所误以为的那样简单。

help sb to do sth=help sb do sth 帮助某人做某事
America's priority is to help nations (to)defend themselves.

美国最优先考虑的是帮助各国自卫防御。

   lead sb to do （不是lead sb do）。例如：What led you to believe it ? 什么使你相信它？/ Her advice led him to do it again. 她的劝告使他卷土重来。（摘自外研社、建宏《英汉多功能词典》）