I heard them giggle when I passed by the girls.

问题描述:

I heard them giggle when I passed by the girls.
请对本句 I heard them giggle 进行语法分析。

词组hear sb.do sth.句中giggle是动词“咯咯地笑”.译为“我听见他们在咯咯地笑.”因为整个句子是过去时态 不能用 I heard them giggled 吗? hear sb. do 只能是动词原型吗?