Is this a car?回答为什么不能是Yes,this is.

Is this a car?回答为什么不能是Yes,this is. Is this you pencil 为什么不能回答 yes,this is.而是要用Yes,it is. This is a man.的回答是Yes,It is . 为什么Is this your brother?回答是yes,it is 不是yes he is. this is a car IS this your car?回答1、yes,it is 2、yes,this is .请问是回答1正确还是2正确? --Is this his ____? ---Yes,it____ a German car. --whose watch is this ?---【 】,回答为什么不能是this is lucy‘s 而是it is Is this a radio?是选择哪种回答：yes,it isn't. yes,it is. A:Is this your car,Jim?B:Yes.Iam cleaning the car.A:It is a Is this a book?" "Yes,this is." ls this an apple?的肯定回答是Yes,this is an apple.还是Yes,it is an a