Question

介词后面的动词是什么形式

Answer 1

介词后面动词作宾语时一定要用ing形式。
如：
1.He is good at singing .
= He does well in singing .
他擅长于唱歌。

2 .He is looking forward to hearing from his parents .
他正盼望着收到他父母亲的来慧空数信。
3. He goes to school without having breakfast every morning .
他每天早上没吃早餐就上学。

拓展（介词的用法）：
1、介词+名词，如：at school，at home,on the desk/wall 。
2、介词+动名词（doing ) 如：He is good at playing football.
3、亏拦介词+表示时间的词（固定用法前首） :in the morning/afternoon / evening ; at noon /night; at six o'clock .
4、介词+人名:如： We are all here except Jim .
5、介词+名词性短语:如：The composition is very good except for a few spelling mistakes.