| 词组 | since |
| 释义 | 1． 常与现在完成式或过去完成式连用: It has been years since I last saw him. ( 现在完成式) When I came across him last month， it was the first time we had seen each other since we graduated from college. ( 过去完成式) 2． 有时，与 since 连用时，主句也用一般现在时和一般过去时: It is over 25 years since they last met. ( 一般现在时) It was 10 years since Robert and I had started the band. ( 一般过去时) 3． 在由 since 引导的从句中，用一般时态和完成时态均可: It is more than two years since he returned to India. ( 一般现在时) It had been two months since he had returned to Sunnydale. ( 过去完成式) |
| 随便看 |
英语用法大全包含3679条英语用法指南，基本涵盖了全部常用英文词汇及语法点的翻译及用法，是英语学习的有利工具。