Question

use the past indefinite or the present prfet instead of the infinitives in brackets
How long you(to know ) him? HE (to livr) in LENIGRAD for 2 years and then (to go) to Sibiria
When he (to arrive ) ?
I (to read )this book when i was at school
i cant go with you as i (not to finish)my work

Answer 1

How long have you known him?
He had lived in LENIGRAD for 2 years and then went to Siberia.
When did he arrive?
I read this book when I was at school.
I can't go with you as I have not finished my work.