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"Not until"是一个常用的英语表达,意为“直到……才……”。它通常用于强调某个行动或状态发生的时间晚于预期。以下是一些关于"Not until"的用法示例:
1. Not until + 简单过去时
"Not until"常与简单过去时连用,表示某个行动或状态在过去的某个时间点之前一直没有发生。例如:
- Not until I got home did I realize I had left my phone at the office.(直到我回到家才意识到我把手机落在了办公室。)
- She didn't understand the instructions not until the teacher explained them again.(直到老师再次解释才理解了这些说明。)
2. Not until + 过去完成时
当"Not until"引入的时间点是过去某个时间之后的时候,通常使用过去完成时。例如:
- I didn't finish writing the report not until midnight.(我直到半夜才写完了报告。)
- They didn't realize they had taken the wrong train not until they arrived at the station.(他们直到到达车站才意识到坐错了火车。)
3. Not until + 现在完成时
"Not until"也可以与现在完成时连用,表示某个行动或状态一直没有发生,直到现在为止才发生。例如:
- Not until recently have I realized the importance of time management.(直到最近我才意识到时间管理的重要性。)
- He hasn't been able to speak English fluently not until he started practicing every day.(直到他每天开始练习才能流利地说英语。)
"Not until"的用法较为灵活,需要根据具体语境和时间点来选择使用哪种时态。希望本文能够帮助读者更好地理解和运用这个英语表达。