This is my friend 和 These are my sist 改成否定句怎么改啊,急...

this is my friend This is my friend,John. this boy is my friend this is my friend jane Is,new,this,my,friend(.) This is my friend This ( )( )my friend(改为否定句) This is mine friend or This is my friend why? this is my my friend(变复数) This is my friend.She is quiet This is my friend.These are my friend. this is betty.she is my friend 和 her name' betty.she is my friend有什么区别 This is my friend 改为复数形式 This is my friend是什么意思快 This g____ is my friend,AMy, This litter is ( )my pen friend Tony this is my friend改为疑问句 this is my friend.(改为否定句) This is my friend Lucy.She_____in Londou