look forward to是加doing还是加do?

look forward to是加doing还是加do? they look forward to watching the match.watching为什么要加ing?是look forward to 的固定用法吗? look forward to 的意思是? 急look forward to与Look forward look forward to等于 Look forward to造句 look forward to 造句 look forward to look forward to,wonder look forward to your look forward to doing. look forward to look up/look forward to look forward to 后加V.ing?是吗 look forward to 的后面什么时候动词不用加ing? I look forward to seeing you.为什么see加ing look forward to为什么前面要加be动词 look forward to后加that是否正确