СРОЧНО! ПОМОГИТЕ С АНГЛИЙСКИМ . Нужно раскрыть скобки
1)I (to write) an English exercise how.
2) I (to write) an English exercise at this time yestenday
3)My little sistrer (to sleep) now
4)My little sister(to sleep) at this time yestenday
Буду благодарна

I'm writing an English exercise now. I was writing an English exercise at this time yesterday. My little sister is sleeping now. My little sister was sleeping at this time yesterday.