поставьте вопросы к выделенным словам, обращая внимание на видовременные формы глагола. 1. we attended this sales conference yesterday. 2. i was operating the computer during two hours yesterday. 3. he has collected all the data already. 4. we always take the metro to the office.
2) How much time were you operating the computer yesterday?
3) What has he done already?
4) Who does always take the metro to the office?