除了第4个外,都对
When 在此指的是一个过去的特定时间,所以得用一般过去时
④When was it?我的意思是比如:-My birthday part is next mouth.-Oh,when is it?所以,要有语境这个应该说:--My birthday party is next mouth.--Oh,when exactly is it?因为对方已经给了个宽泛的时间next mouth, 所以你这里问的应该是具体什么时候, 用exactly 再:What date is it today?= What is the date today?