| 单词 | before |
| 释义 | before prep.在……以前；在……前面〖同〗in front of/conj.在……以前/adv.以前 〖析〗ago用在一般过去时中，“现在”为参照，多长时间“以前”；before则是以“过去某一时间”为参照，多长时间“以前”。ago前的动词用一般过去时，而before前的动词用现在完成时，如：My grandfather died two years ago, but my grandmother had already died three years before.本句后半部分实际等于my grandmother died five years ago,其中before=before that=previously。 |
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