| 词组 | once |
| 释义 | once ◊ used to mean 'only one time' If something happens once, it happens only one time. I've been out with him once, that's all. I have never forgotten her, though I saw her only once. When once is used with this meaning, it usually goes at the end of a clause. ◊ used to talk about the past You also use once to indicate that something happened at an unspecified time in the past. I once investigated this story and it seems to be wholly untrue. Once we were stopped by a woman in a long cotton dress. When once is used with this meaning, it usually goes in front of a verb or at the beginning of a clause. You also use once to say that something was the case in the past, although it is no longer the case. He had once been a big star but now he was finished. These carvings were once brightly coloured. She was in the trade herself once. When once is used with this meaning, it usually goes after 'be' or an auxiliary, or at the end of a clause. ◊ WARNING You do not use once to indicate that something will happen at some time in the future. Instead you use one day for events in the distant future, or sometime for events in the fairly near future. One day, you'll be very glad we stopped you. I'll give you a ring sometime. ◊ 'at once' If you do something at once, you do it immediately. She stopped playing at once. I knew at once that something was wrong. |
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