关于see sb do或doing的用法
用动词的适当形式填空.
1.This morning I saw him _________ (do) his homework when I went into his room.
2.This morning I saw him _________ (do) his homework for some time and then play basketball.
3.When I was on my way to school this morning,I saw two thieves _________ (run) out of the bank.
4.I often see the boys _________ (play) football on the playground.
5.I saw him _________ (walk) into the building at that time.
帮我具体解释一下这些句子的do的用法!是不是和在什么时段有关系!总之,具体些!我当晚就要解决,