| 词组 | since |
| 释义 | since You use since to say that something has been the case from a particular time in the past until now. It's been on my desk since 1959. I've been wearing glasses since I was three. Note that in these sentences you use a perfect tense with since. You do not say 'It is on my desk since 1959' or 'I am wearing glasses since I was three'. You can also use since to say how long ago something happened. When you use since like this, you use a simple tense. For example, instead of saying 'I last saw him five years ago', you can say 'It's five years since I last saw him'. It's three months since you were here last. It's years since I saw a photo of him. ◊ 'for' However, if you want to say how long something has been the case, you use for, not 'since'. We've been married for seven years. See entry at ↑ ◊ 'during' and 'over' If you want to mention how long something has been happening, you use during or over. A considerable amount of rain has fallen during the past two years. Things have become noticeably worse over the past two or three months. See entries at ↑ ◊ 'from ... to' If you want to mention when something began and finished, you use from and to. ...Thomas Jefferson, the President of the United States from 1801 to 1809. Instead of 'to', you can use till or until. ...from nine in the morning till 5 p.m. Note that you do not use since and to. You do not say, for example, 'the President of the United States since 1801 to 1809'. ◊ used to mean 'because' Since can also be used to mean 'because'. Aircraft noise is a particular problem here since we're close to Heathrow Airport. See entry at ↑ |
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