We often hear him singing English songs. 改为We often hear him sing English songs. hear为省to的不定式。 因此后面只能加do,doing两种情况。应此句中有often，所以用do。
改为WeoftenhearhimsingEnglishsongs.1.hearsth表示听见了动作的全过程 ingsth.表示听见动作正在进行2.如题目的这句话WeoftenhearhimsingEnglishsongs.我们经常听见她唱英文歌听到了整个唱歌的过程WehearhimsingingEnglishsongs.我们听见他正在唱歌听到动作正在进行3.因为题目中有个OFTEN,表示经常的动作,或反复发生的事情,主语我们应该是经常听到唱歌这个动作的全过程,所以不能用ING形式.注意如HEAR用于被动,后面要用TODO的形式HeisheardtosingEnglishsongs.
We often hear him sings English songs.
often的换就不能用singing了，要用to sing
答：C is not correct. We often hear the children sing the English song before class.详情>>
答：B 被动语态，be found to do. A中的made与found均为过去分词，冲突！详情>>
问：hArd work 和hArd--working有什么区别
答：一个是名词 一个是形容词撒详情>>
