look（ing） forward 后面加ing形式吗?还是原形嘞?

菡菡~
looking forward to.和I look forward to都有,但是两者有区别
两者其实区别不大,勉强可以这样的解释：
1、从语气上来说,-ing 形式比较personal 和friendly,和 look forward to...相比较少为正式,如果你要表示礼貌而有亲和力则用looking forward to...,look forward to在非常正式严谨的business场合比较适用.
2、国外英语论坛上native speaker给的解释二：
“The difference is how the speaker perceives their own words:
an action seen as a whole/accomplished (I look forward...) or continuing (I am looking...).
一个动作的结束（look forward to...）和一个动作的持续（looking forward to...）
本来是来看看的,正好你提问了,我来解决看看,错了别怪我哈~

ing··因为look forward to，to是介词··

look forward to doing

原形就够了 副词修饰动词、