Use either an infinitive or a gerund in each pair of sentences.

Here are the answers: A: 1. Don't forget to email me when you are away on holiday. 2. We will never forget emailing you to America a year ago. B: 1. Always remember to turn off the gas when you go out. 2. He will always remember acting on the stage for the first time. C: 1. We didn't mean to hurt you at all! 2. It would mean queuing for a long time. Is that OK? D: 1. Now I regret buying the cottage that is so far from the center. 2. I regret to say that you have failed the interview. E: 1. The boy tried to reach the ceiling, but he wasn't tall enough. 2. Try knocking if nobody answers. F: 1. The man stopped to take his breath, he had been running. 2. A year he stopped smoking and hasn't smoked ever since. G: 1. I prefer swimming to jogging. 2. I'd prefer to go out tonight.