每种时态都有典型的标志词，掌握标志词是快速判断时态的钥匙。
要点讲解
- 一般现在时：always, usually, often, sometimes, never, every day/week, on Sundays。
- 一般过去时：yesterday, last week, ...ago, in 2020, just now, the day before yesterday。
- 一般将来时：tomorrow, next week, soon, in + 时间段, in the future。
- 现在进行时：now, at the moment, look, listen, right now, these days。
- 过去进行时：at that time, at 8:00 yesterday, when/while 从句。
- 现在完成时：already, yet, ever, never, just, so far, since, for + 时间段, recently。
- 过去完成时：by the time, by the end of + 过去时间, before/after 过去的动作。
- 过去将来时：宾语从句中的 would do, the next day（主句过去时）。
经典例句
- I have already finished reading the book.
我已经读完了这本书。（already 完成时） - He was doing his homework at 8:00 last night.
他昨晚8点在写作业。（at 8:00 last night 过去进行时） - We will have an English test next Friday.
我们下周五将进行英语测试。（next Friday 将来时）
易错提醒
- 做题顺序：先找时间标志词→确定时态→选动词形式；没有标志词时根据句意和上下文判断。