Question

"Write to me as often as you can."said his wife. (reported speech)

Answer 1

Ответ:

His wife asked him to wrote as often as he could

Просьбы и приказания в косвенной речи выражаются словами ask/tell

Если глагол в главной части (asked) в прошедшем времени, нужно соблюдать согласование времен