1. He is writing a test at the moment.
•What is he doing at the moment?
•Is he writing a test at the moment?
•What is he writing at the moment?
•Who is writing a test at the moment?
•He is writing a test at the moment, isn't he?
2. My friends were happy last week.
• were your friends happy last week?
• Who were happy last week?
• When were your friends happy?
• Whose friends were happy last week?
• Your friends were happy last week, weren't they?
3. She watched the film yesterday.
• What did she do yesterday?
• What did she watch yesterday?
• When did she watch the film?
• Who did watch the film yesterday?
• She watched the film yesterday, didn't she?
4. We have breakfast every day.
•. What do we have every day?
• How often do we have breakfast?
• Who have breakfast every day?
• We have breakfast every day, don't we?
2.Teachers have found the overhead projector to be invaluable as a teaching aid.
3.The majority of critics thought the film to be highly original.
4.Many of the audience considered the speaker to have overstated his case.
5.Evidence showed the man’s alibi to have been a complete fabrication.
6.The architect’s clients had assumed the construction of such a building to have been impracticable, whereas the architect himself believed it to have been perfectly feasible.
7.At a very early age, Paderewski revealed himself to be a master of the keyboard.
8.Everyone knew him to be a man of integrity.
9. Detectives investigating the robbery discovered 20,000 worth of precious stones to be missing.