when is it是不是等于what time is it?what time is it换种方法提问意思不变

when一般用来提问大概的时间；而what time用来提问具体时间.例如：I went to Beijing last summer.（可用When did you go to Beijing?来提问.）I get up at seven o'clock.（可用What time do you get up?来提问.）...when is it是不是等于what time is it?可以替换的。