时态题的解题顺序永远是：找标志词 → 定时态 → 套结构。把这张表背熟，时态选择变成「对号入座」。
八大时态总表
| 时态 | 结构 | 标志词 |
|---|---|---|
| 一般现在时 | do / does（三单） | always, usually, every day, often |
| 现在进行时 | am/is/are + doing | now, look!, listen!, at the moment |
| 一般过去时 | did | yesterday, last week, in 2020, ago |
| 现在完成时 | have/has + done | already, yet, just, ever, since, for |
| 过去进行时 | was/were + doing | at 8 last night, when + 过去时 |
| 过去完成时 | had + done | by the time, before, 过去的过去 |
| 一般将来时 | will do / be going to do | tomorrow, next year, soon, in+时间段 |
| 现在完成进行时 | have/has been doing | for two hours（一直持续到现在） |
辨析一：一般过去时 vs 现在完成时
- 一般过去时强调「过去某时做了」，和现在无关，必须有明确过去时间点
- 现在完成时强调「对现在的影响」，不能和明确的过去时间点连用
- 错误示例：I have seen the film yesterday ❌ → I saw the film yesterday ✓ / I have seen the film ✓
- since + 时间点（since 2020），for + 时间段（for three years）都搭配完成时
辨析二：三单到底加不加 s
一般现在时里，主语是第三人称单数（he/she/it/单个人名）动词才加 s。易错点：Everyone / Nobody / Each 也是三单！Everyone likes him ✓，这是选择题埋坑重灾区。