Question

1) As his eyes are bad he (to have) to wear glasses
2) I don't want him (to say) in behind my back
3) The dinner (to cook) before the family came home
4)I didn't know that you already ( to receive) the letter
5) If they (to have) plenty of time yesterday they wouldn't have missed the train

Answer 1

1)have ; 2) to say ; 3) had been cooked; 4)have already received ; 5)had