I have heard him speak about you often.为什么用speak而不用speaks?

I have heard him speak about you often.为什么用speak而不用speaks? I have heard hin speak about you often heard有一种用法,这里不能用speak 选择填空1.I've heard him ( ) about you.A.spoke B.speaks C.speak I have heard him. about you often I've heard him talk about you often?这里为什么要用talk原型啊? the people who speak it.为什么speak不用speaks呢. 18.I've heard him ____ about you often. I speak loudly so that i can make myself__(hear) 为什么是heard,而 Have you ever heard of Pisa?I often 85 about Pisa when I was I (speak/speaks) Chinese and English. i can't have you() like that about your father a to speak b A:Have you two met?B:No,but I heard a lot about him