按要求改写句子。(24分)
（1）It's cold in winter. (就画线部分提问)
________the weather________in winter?
（2）There are four seasons in a year.(就画线部分提问)
________ ________seasons are there in a year?
（3）Give him a knife! (改为否定句)
________ ________him a knife!
（4）He goes to school by bus. (改为否定句)
He________ ________to school by bus.