Completar frases For/since/agoVersión en línea Fill the gaps with by using for, since or ago por Raquel M 1 since for for for for ago ago ago since He used to sing in a choir twenty years They haven't seen each other four years She left university two years He knew how to speak Russian , but he hasn't spoken it at least six years She hasn't done it again it happened I have lived here four years now You have studied English you were at school I told them to be ready half an hour I need a break ! I've been working at the computer 3 straight hour s