that boy is good.改复数

that boy is good.改复数 Is that boy your brother 改复数形势 He is a boy改复数 is that gril your friend 改复数 is that a mouse?改复数句 that is my photo改复数 That is a photo.改复数 is this a boy or a girl改复数句 英语改句子变否定句一般疑问句肯定回答否定回答复数句：this is her futher.this is my good friend.he is abrave boy?it is a yellow quilt?that is your pencil case.this is his book.iam fine.her pen is yellowandwhite.my idcard is bi he is a good boy.改成一般疑问句怎么改? He is a good boy（改否定句） That book is new.I am a boy.She is a girl.Is the dictionary on the desk?改复数形式 1：is that his pen?改复数 2：she is my good friend.改为一1：is that his pen?改复数2：she is my good friend.改为一般疑问句3：that is Cheng Long改一般疑问句4：it's dave.改一般疑问句 that boy in our class is japanese改成复数句 she is a good student.改为复数形式怎么改 that(复数) this(复数) brother(对应词) is(复数) boy(复数) I(形that(复数)this(复数)brother(对应词)is(复数)boy(复数)I(形容词性物主代词)mother(对应词)these(对应词)parent(复数) what's the weight of that boy?改成----- ----- is that boy?怎么改? That child is very good 怎么转换单复数句