I saw him coming up.coming up是什么?现在分词?可以帮我分析一下这个句子的结构吗？

I saw him coming up.coming up是什么?现在分词?可以帮我分析一下这个句子的结构吗？ i saw him coming yesterday.它错在哪里 he saw two policemen coming ___ him he saw two policemen coming ___ him．【介词】 有一题高中完形填空不知道怎么错I saw a beam（房梁）coming down and to reach him I placed myself over him.I saw a beam（房梁）coming down and to protect him I placed myself over him.上面哪句正确?意思又分别是什么? this is the man_____last nightAwhom I saw him Bwho I saw Cwhich I saw Dwho I saw him I saw the ____（happy）from his face and tried to cheer him up in my own way. i saw him ____(walk)into the I saw him go out just now. I saw him ____ into that room. I saw him in the street是什么意思 I saw him go 什么 the classroom I saw him dancing.改为被动语态 i saw him yesterday改为否定句 I never saw him again翻译 Suddenlu I heard footstes coming up ()me. I saw he coming in .see为什么用过去式啊 i am up on him