It is I who am to blame.为什么who 后面用am 不用 is?

It is I who am to blame.为什么who 后面用am 不用 is? it is not ----to blame for the problems.a.i who am b.me who am It is I who am wrong. It is I who am your leaderIt is I who ------ your leader.am?,is?,are?为什么? This is who I am.Nobody says you have to like it. “This is who I am. Nobody said you had to like it”出自何处 his is who I am.Nobody said you had to like it! i am who is Who Am I To I am who I am--I am unique It takes all kinds to make a world. Who is it?---I am b_______,Dad.填空. it you or I who _ to be responsible for the accident? A.Is;am B.Is;are C.Are;am D.Are;is it does not matter who____i am talking to.A.who it is B who it is that C.it is who D.it is whom ---hello!who is seaking?---hi,Ann.___Mary.A I am B it is C this is 请分析句子成分 It does not matter who it is I am talking to.谢谢cindystone的答案，可否说得具体一点呢？ It is not I who ______ wrong.A.is B.are C.am D.has been My dear It is I who am wrong!but I miss you!drar! Canthy,the door bell is ringing!I,m doing the dishes.--- Mun,I ___ see who it is.A.would B.will C.am about to D.am going to 为什么选B.