1 a. Passing the kitchen, he stopped drinking/ to drink a large glass of water.
b. They stopped talking/to talk when the teacher walked into the classroom.
1. a. Although she asked him to stop, he went on tapping/ to tap his pen on the table.
b. Dr Harris welcomed the members of the committee and went on introducing/ to introduce the subject
of the meeting.
2. a. I regret telling/ to tell you that the model you want is out of stock.
b. It cost me a fortune, 'but I don't regret spending/ to spend a year travelling around the world.
3. a. Remember checking/ to check your answer before handing in your exam paper.
b. I remember putting/ to put the money in the top drawer, but it's not there now.
4. a. Have you forgotten meeting/ to meet me years ago?
b. Don't forget finding out/ to find out how many people are coming on Saturday.
5. a. I tried getting/ to get the table through the door, but it was too big.
b. I tried taking/ to take some aspirin, but the pain didn't go away.
6. a. He needs working/ to work harder if he wants to make progress.
b. It's difficult problem. It needs thinking/ to think about very carefully.
7. a. I think Nick meant breaking/ to break that glass. It didn't look like an accident.
b. If we want to get there by 7.00, that means getting/ to get up before 5.00.
8. a. Can you help me getting/ to get the dinner ready?
b. He looks so funny. Whenever I see him, I can't help smiling/ to smile
9. a. I'd advise taking/ to take more exercise.
b. I'd advise you taking/ to take more exercise.