My sweater is long（变为否定句）.The yellow bag is ￥15.（便一般疑问句）.Are his pants blue?（做否定回答）.That apple is 《green》（对书名号里的提问）.Those long rulers are 《20 yuan》（对书名号里的提问）
My sweater is long（变为否定句)
My sweater is not long.
否定句一般就是在be动词（is am are）后加上表示否定意义的not,或者是和助动词一起使用,比如：don't/doesn't.
The yellow bag is ￥15.（便一般疑问句）
Is the yellow bag ￥15?
一般疑问句就是将be动词提到句首,其余部分按陈述句语序排列即可.
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》（对书名号里的提问）
What's the color of that apple?
题目要求对颜色进行提问,即是“什么颜色的意思”,用英语表达便是What's the color of +要问颜色的物品
Those long rulers are 《20 yuan》（对书名号里的提问）
How much of those long rulers?
问价格是用how much,而且不管是单数还是复数,一律用how much.
