为什么这里some of对了I play some of songs

为什么这里some of对了I play some of songs I ofen watch my little brother play （play） football after school这里为什么填play 英语句子成分问题 I only know some of them.这里的of them 是什么成份?为什么?在么？ I first play computer game six months ago为什么这里play用的不是过去式 I saw Li Yundi play the piano last concert.为什么这里用原形play Some of can play games with me,and some of them can chat with me,i feel that is enough. I often spend some of my free time ____ (play) volleyball. i often spend some of My free time play basketballfor my school team.句子改错 could I have some milk?这是一般疑问句,为什么这里的some,没改成any I learned ____(play) the violin when i was eight years old .这里的PLAY为什么不变成PLAYED而变成TO PLAY呢 i visited a factory with some of my friends_____produces computers.A.where.B.who.C.which.D.whom这里为什么不选B,而选C? I have many books,some of them are on English.这个句子表达正确吗?我知道这个句子是错误的,但是我不知道为什么在这里不能用some of them. I play basketball to help some poor people这句话有没有错误?为什么? I often watched Mike play basketball after school.这里有often为什么还要用washedquickly I see the children _________cards.这里填to play 还是playing.为什么? i'd love to play basketball.这里的would 为什么用? I found them playing football at five yesterday.这里的play为什么要用ing形式 When i got there,I saw some boys __on the playground.这里为什么填playing呢?