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

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.