I tried taking an aspirin but it didn't help. - to test something, Try to be quiet when you come home late. - to do sth. that is not easy, I stopped smoking. - to stop with an activity, I stopped to smoke. - to stop in order to do something, (1) I remember switching off the lights when I went on holiday. - looks back in the past (1), (2) Remember to switch off the lights when you go on holiday. - looks into the future (2), I regret being late for school. - you did sth in the past and you are not happy about it, We regret to inform you that the flight has beeen delayed for another two hours. - to tell bad news and you are not happy about it, He'll never forget spending so much money on his first computer. - looks back in the past, Don't forget to spend money on the tickets. - looks into the future,

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