a friend of 是加 ours 还是 us

a friend of 是加 ours 还是 us a friend of ours写成our a friend可以吗`ours换成us可以吗/为什么? A friend of ours are waiting for us这句对吗,要不要把are 改成is?这句主语是A we met a good friend of ours at school?对a good friend of our The are the teachers of ours还是of us请老师回答 we went to visit a friend of ours（）the afternoom of last wed 英语翻译不知道到底是our love还是ours love还是love of us?但我把上面三句话都分别再来翻译成中文 2.He is a good friend of ( ).A.our B.our's C.ours we should take care of （ ）.A.us B.our C.ourselves D.ours by the time you finish your homework,all of us ------ ours a We went to travel with some feiends of __.A.us B.ours C.our 他的一位朋友 是a friend of his 还是 a friend of him