Mum,this is kate,who I knew in Paris.为什么用who不用whom?

Mum,this is kate,who I knew in Paris.为什么用who不用whom? kate,this is hello,8217748.may i to tomhello,8217748.may i ( )to tomyes,this is tom speaking .who is ()?this is kate 在that is 后面可不可以加人名?例如：That is Kate.这句话对么?提问who is this?回答：这是凯特。英文可不可以说 It's Kate.或者是 this is Kate .回答到底哪个对？ Who is that behind tree?____me,Mum.A;lt's B;That's C;This is D;He's 补全对话 A:Hello B:Hello May I speak to kate A:This is Kate ( ) .Who’s ( B:Oh ,补全对话A:Hello B:Hello May I speak to kate A:This is Kate ( ) .Who’s ( B:Oh ,hello .This is Tom .I’m going ( ) the cinema .Would you like to go ( ) me I hav 补充对话 A:Hello B:Hello!May I speak to Kate A:This is Kate ( ) .Who’s ( ) B:Oh ,补充对话A:Hello B:Hello!May I speak to Kate A:This is Kate ( ) .Who’s ( ) B:Oh ,hello .This is Tom .I’m going ( ) the cinema .Would you like to go ( ) me I A.Hello!My I speak to Tom ,please?B.Who,sthat please?C.This is kate speaking.D.Hello ,kat Is this your mum?怎么回答? is this your mum no,__ __ oh,jane,this,is,my,sister,kate. 是this is my sister kate吗 this is kate ____ 电话用语 IS this leter from kate to Ann 1This is Jim.His pen is the red.2 Who’s bag is that?It is Mum's.找错一处并改正明天交的, 填写介词：1.____my way to school,I met My Green.2.Mum is cooking_______the kitchen.3.---Who is_____dudy today?---Tom(is).4.This book is different_____that one. Mum,this is my friend Eric.、“And Eric ,this is my Mum,Mrs Lopez.”哪句放前面? Who is this man?