look forward to 的用法是什么?

问题描述:

look forward to 的用法是什么?
是I'm look forward to doing 还是I look forward to dong
是He is look forward to doing 还是he look forward to doing 要随人称变化而变化吗?加不加s?

是look forward to doing,要根据人称的变化改变数,第三人称要加s