问:How many days are there in December?/十二月份有多少天?
简单的回答:31 days/31天
完整的回答:There are 31 days in December/十二月份有31天
问:Is your birthday in September?/你生日是在九月份吗?
肯定回答:Yes,it is./是的,在九月.
否定回答:No,it isn't./不,不是的.