помогите с временами1)The children (to open) the book when the teacher

Помогите с периодически
1)The children (to open) the book when the teacher ( to come)
2)Ann (to study) English before she ( to enter) the institute
3) When Tom ( to read ) book, he ( to know) a lot of ineresting things
4)Mother (to cook) dinner before the children ( to come) home
5) Lena ( to go) to school before her father ( to do ) his tas
6) Bob (to write) the letter before he (to go) to bed
7)Father ( to do) his work before the children ( to get) up.
8) Tom ( to eat) an ice-cream before his mother ( to cook) dinner
9) I (to read) the book before he ( to come) home