I have heard hin speak about you often heard有一种用法,这里不能用speak

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I have heard hin speak about you often heard有一种用法,这里不能用speaking么 Walking
I have heard hin speak about you often
这里为什么不能用speaking
Walking along the river,we heard someone shouting for help.
这里为什么又能用ing了

hear sb doing 听到某人在做某事,表示动作在进行中；hear sb do 听到某人做过某事,表示动作已完成；根据句意：我听到他经常谈到你.（显然不是正在进行的动作,故不能用 speaking)
walking 为现分状语,表示时间,其与句子的主语 we 是逻辑上的主谓关系,该句相当于：When we were walking along the river,we heard someone shouting for help.所以用 walking.

I have heard hin speak about you often heard有一种用法,这里不能用speak I have heard him speak about you often.为什么用speak而不用speaks? I have heard him. about you often 选择填空1.I've heard him ( ) about you.A.spoke B.speaks C.speak I've heard him talk about you often?这里为什么要用talk原型啊? I (have) always heard people talk about.这里有have余没有have有什么区别? Have you ever heard of Pisa?I often 85 about Pisa when I was 18.I've heard him ____ about you often. ___ I have often heard this song, I have never heard you sin have you ever heard someone speak in a language that you cou 翻译：Diogenes ,I have heard a great deal about you . I have heard both teachers and students____(speak)well of hi