sb.cannot wait to do sth.

sb.cannot wait to do sth.
sb.cannot wait to do sth.

sb.cannot wait to do sth.
"Cannot wait"就是不能等待的意思.那么“Cannot wait to do sth”就是不能等待而要去做某事,也即急着去做某事.那么整句的意思是：某人急不可待地去做某事

某人等不及做某事

cannot wait to do sth就是迫不及待做某事
sb. cannot wait to do sth就是：某人迫不及待做某事
例如：I can not wait to read the interesting book.我迫不及待地读这本有趣的书。

sb. cannot wait to do sth. 某人迫不及待想做某事
cannot 不能

上楼的几位说的都没错，作者就赶紧了（Liao）了这个问题吧。