用适当的非谓语动词形式填空

问题描述:

用适当的非谓语动词形式填空
i often hear him ______(sing).
i heard him _____(sing).
i heard hin _____(sing)just now.
并说明为什么.
要讲解的好、

先说明hear后面的动词只有两种形态:一种是加动词原形,另一种是加动词的现在分词(也就是ing形式)i often hear him ___sing___(sing).经常听到就是说这件事经常发生,所以用动词原形.i heard him __singing___(sing)...