Past and Future SimpleVersión en línea Past and Future Simple por Liliya Zaripova 1 A mainframe is the most powerful type of computer. (Past Simple) Written answer 2 A laptop also calles a notebook PC. (Past Simple) Written answer 3 A wearable computer runs on batteries. (Past Simple) Written answer 4 A tablet PC looks like a book. (Future Simple) Written answer 5 You use a stylus with PDA. (Future Siimple) Written answer