does he have a big house?
has是实义动词,对应的第三人称单数助动词是does,把does提到句首,has变成原型have,其他不变.
Tina has knifes
knife是可数名词变复数直接加-s
her legs are long
她的腿很长
They don't have some brothers and sisters
have是实义动词,所以直接加don't构成否定句.
- are his eyes small?
-No,they aren't
are是be（am,is ,are）动词,所以直接把are提到句首,其他不变.