this is换he/she is,a set of keys换keys可以吗?为什么a set of keys是复数,下面一句却是is this your set of keys.is不是单数用的吗?什么情况下用at?什么情况下要换第三人称形式?什么单词前面要加the?什么情况

this is my dog he/she is a he/she is < >, he/she has< >ears he/she has a< >tai怎么写 ( )is my brother Jim.Jim,( )is my friend Amy.A.This;she B.he;she C.This ;this Is this----------eraser A、he is B、he C、her D、she Whose book is this?---IT IS ( )A.me B.he C.she D.mine This is my pet.He is a( this is换he/she is,a set of keys换keys可以吗?为什么a set of keys是复数,下面一句却是is this your set of keys.is不是单数用的吗?什么情况下用at?什么情况下要换第三人称形式?什么单词前面要加the?什么情况 This is my good friend.His name is JIM Green.He is an English boy.He is eleven.He is in No.1 MiddleSchool.He is in Class 3,Grade 1.This is my Chinese teacher.She is a woman.Her name is Wang Ping .She is 24.She is in No.1 Middle School,too.She's my go Jim,( )is Julia.She is my good friend.A:she B:this C:he D:that（请说出理由）Jim,( )is Julia.She is my good friend.A:she B:this C:he D:that Is this a teacher?的肯定回答是什么?可以是Yesi,it is 还是Yes,he/she is Alice,-------my good friend,Bill.He is a dentistA.he isB.she isC.that isD.this is ( )is Mary and ( ) is Mike.Nice to meet you!中间的空填什么?选项有 A.She he B.This that C.This he D.She that Ms Lin,___ my mother.Mum,___Ms Lin A this is,she is B she is,this is C this is,this is D this is,th Is that Miss Li speaking?yes,this is Mis Li speaking ____________?A who are you Bwho is he C who is she D who is that Hello,Sam.----- is Susan .A.she b.he c.this d.that.选哪个? This is ___ English teacher.A、he B、his C、she说出为什么要选这项 Hello,Lucy,______ Millie.（ ）A.he isB.her name isC.she isD.this is Hello,Sam.----- is Susan .A.she b.he c.this d.that选哪个 ----- is my friend A,this B,he C,she D ,that