My sweater is long（變?yōu)榉穸ň?
My sweater is not long.
否定句一般就是在be動詞（is am are）后加上表示否定意義的not,或者是和助動詞一起使用,比如：don't/doesn't.
The yellow bag is ￥15.（便一般疑問句）
Is the yellow bag ￥15?
一般疑問句就是將be動詞提到句首,其余部分按陳述句語序排列即可.
Are his pants blue?（做否定回答）
No, they aren't.
肯定回答是Yes,they are.
That apple is 《green》（對書名號里的提問）
What's the color of that apple?
題目要求對顏色進行提問,即是“什么顏色的意思”,用英語表達便是What's the color of +要問顏色的物品
Those long rulers are 《20 yuan》（對書名號里的提問）
How much of those long rulers?
問價格是用how much,而且不管是單數(shù)還是復數(shù),一律用how much.