rainy days often make people sad.改为一般疑问句讲清楚为什么.用助动词do还是does.
问题描述：
rainy days often make people sad.改为一般疑问句
讲清楚为什么.
用助动词do还是does.
答
Do rainy days often make people sad?
因为days是复数，does用于第三人称单数
答
Do rainy days often make people sad?
用do 因为主语是rainy days，而在rainy days中， days是中心词，是复数，所以用do
答
Do rainy days often make people sad.?
days是复数,make是实义动词所以用助动词do
答
Do rainy days often make people sad？
主语 rainy days 是复数，谓语动词要用复数的do