We saw her play the piano at the party.这句话里play为什么用原形呢?

We saw her play the piano at the party.这句话里play为什么用原形呢? we saw her enter the room just now.=she I saw her play when I was I saw her play the violin when i was eight上句中的play为什么不用played? 两个改被动的英语问题!We saw some boys play football behind the house Some boys ____ ____ _____ play football behind the house I saw her run into the old house She ____ _____ _____ run into the old house我觉得给的空很奇怪啊 1.light _(go) 2 I can see some ( )(play) on the play ground.3 l1.light _(go)faster than sound.2 I can see some ( )(play) on the play ground.3 he ___(do)look well when I saw her last time .4 after the meeting ,we will have a party ,if you ____(be) fre we saw some old people(play)cards by the lake.按正确形式填空 We saw him play football on the playground.这句话有错误吗? After the c____ rose ,we saw her standing on the stage with a flower in her hand The girl is Jim's sister.We saw her yesterday.改成定语从句 She is the students.We saw her yesterday.（将两个句子连成定语从句） they say,we saw her in the street 改为间接引语不用过去完成时吗 下列的两个简单句合并为带有定语从句的复合句(1)The medicine was quiet helpful .Dr Li gave it to him(2)The play was very interting .We saw it in the night before .(3)Do you know her?We met the woman at the gate(4)The boy plays socce 主动句转被动句1.No one has ever beaten her at tennis.2.We did not notice anything special in his work .3.We have made the empty land a play ground.4.We consider it wrong to shout at a child.5.e saw a stronger ente the hall.6.The pair of shoes We saw Sally play the piano in the music club.请把这句子改成被动语态. Finally,we saw her dancing around the corner with a brand new hula hoopFinally we saw her dancing around the corner with a bright new hula hoop (呼啦圈) whirling (旋转) round her middle . 改被动语态（1）they are building a new school . （2）Jim always made the little boy cry .（3）I saw him play football (4) l saw him playing football (5) We call her Lily (6) My friend gave me a CD can her aunt play the