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、
人气：377 ℃ 时间：2020-06-07 10:58:39
解答
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)...
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