1、i went to school yesterday.

我昨天去学校。

2、i bought a bag the day before yesterday.

我前天买的包。

3、i dated a good friend the day before yesterday.

我前天约的好友。

4、.i finished my homework this morning.

我在早晨就已经完成了作业。

5、the light went out, and the room was plunged into darkness.

灯熄了，屋里陷入一片漆黑。