It's time you started on your homework.

　　你該做功課了。

　　Haven't you finished your homework yet?

　　難道你還沒(méi)有完成家庭作業(yè)嗎？

　　How long did you spend on your homework?

　　你做家庭作業(yè)用了多長(zhǎng)時(shí)間？