i didn't know you liked tis book book为什么用过去式

问题描述:

i didn't know you liked tis book book为什么用过去式

i didn't know you liked this book
用过去式表示我之前不知道你喜欢这本书,但是现在知道了.didn't后不是加原型么know不是原型么那like为什么用过去因为前面didn't 用过去式