动词时态迷宫：一招搞定since和for的正确用法

【来源：易教网 更新时间：2025-12-20】

嗨，亲爱的英语小达人！今天咱们聊聊一个让无数同学抓狂的语法点——动词时态里的“since”和“for”。是不是每次看到“for”就用现在完成时，结果被老师打叉？别慌，作为带过1000+学生的英语老教师，我太懂你的痛了！

上周，我班上的小雅写了“我在这里住了”，老师批注：“用for还是since？”，她直接哭了。但今天，我就用最接地气的方法，帮你彻底拿下这个难点。

为什么“since”和“for”这么难分？

先来个真实场景：小明在写作文时，写了“I have lived here for twenty years”，结果老师画了个大红叉。他委屈地问：“老师，中文说‘住了’，英语不也该用‘for’吗？”我笑着解释：关键在动作是否还在继续。

现在完成时（have/has + 过去分词）表示动作从过去开始，持续到现在，或者对现在有影响。而“for”表示时间段，“since”表示时间起点。

- for + 时间段：强调“多久了”，动作持续到现在。

例：I have lived here for twenty years.（我住这儿了，现在还住。）

- since + 时间点：强调“从什么时候开始”，动作从那个时间点持续到现在。

例：I have lived here since I was ten.（我十岁起就住这儿，现在还住。）

重要提醒：当动作已结束时，用过去时。

- 例：I worked here for twenty years.（我工作，但现在已经不干了。）

- 例：I have worked here for twenty years.（我工作，现在还在干。）

小窍门：公式转化法（亲测有效！）

这个方法是我教学生最管用的！当看到“现在完成时 + for + 时间段”，用这个公式转化，瞬间看出对错。动词必须能持续，否则直接翻车！

公式：

\[ \begin{align*}\text{主语 + have/has + 过去分词 + for + 时间段} & = \text{主语 + began to + 动词原形 + 时间段 ago, and is still + 动词原形 + now}\end{align*} \]

- 正确例子：

Tom has studied Russian for three years.

= Tom began to study Russian three years ago, and is still studying it now.（对！know是延续性动词，可以持续。）

- 错误例子：

Harry has got married for six years.

= Harry began to get married six years ago, and is still getting married now.（错！因为“get married”是瞬间动作，不能持续。）

所以，正确说法是：

Harry got married six years ago.

或

Harry has been married for six years.（注意：be married是状态，可以持续。）

为什么学生总在这里栽跟头？

因为动词分“能持续”和“不能持续”！

- 延续性动词：study, live, work, know（可以持续）→ 用现在完成时 + for

例：I have known her for ten years.（我认识她十年了。）

- 非延续性动词：marry, die, join, leave（瞬间动作）→ 不能用现在完成时 + for，要用过去时或“have been + 形容词”

常见错误大集合（来自我的课堂实录）

- 错：She has been dead for five years.

对：She died five years ago. 或 She has been dead for five years.（be dead是状态，可以持续。）

- 错：I have left school for a month.

对：I left school a month ago. 或 I have been away from school for a month.

- 错：He has joined the army for two years.

对：He joined the army two years ago. 或 He has been in the army for two years.

实战小测试：来挑战一下！

试试看，判断对错（答案在最后）：

1. I have known my best friend for ten years.

2. He has joined the club for two years.

3. My parents have lived in Shanghai since .

4. She has been a teacher for five years.

5. I have got the book for a week.

如何避免错误？记住这三招

1. 先问自己：动作还在继续吗？

- 如果还在，用现在完成时 + for/since。

- 如果已结束，用过去时 + for。

*例：小华去年毕业了→I graduated last year. 但小华现在工作→I have worked here for two years.*

2. 动词性质要分清：

- 延续性动词（study, live, know）→ 用现在完成时 + for

- 非延续性动词（marry, die）→ 用过去时或“have been + 形容词”

*例：I have been a student for six years.（对！be a student是状态）*

3. 公式转化是救命稻草：

遇到不确定，就用公式转化，一试就灵！

*例：I have had this phone for three months.

= I began to have this phone three months ago, and am still having it now.（对！have是延续性动词。）*

真实案例：小华的逆袭

上个月，小华在月考里写“I have been ill for a week”，被扣分。我问他：“ill是状态吗？”他点头。我解释：ill是状态，可以持续，所以“has been ill for a week”是对的。

但如果是“I have got sick for a week”，就错了，因为“get sick”是瞬间。后来，小华用这个方法，语法题正确率飙升！他兴奋地发来消息：“老师，我终于搞懂了！”

语法是你的英语能力的阶梯。every small step counts. 今天的小窍门，明天的满分作文！别怕犯错，犯错是进步的开始。多练几次，你就能像呼吸一样自然地用对时态。

记住口诀：

- for = 多久了（动作持续）

- since = 从什么时候开始（动作持续）

- 用公式转化，错不了！

快去试试吧，下次写作文，把“since”和“for”用得溜溜的！你一定行，我看好你哦！

（答案：1.对 2.错 3.对 4.对 5.错——正确应为“I have had the book for a week”或“I got the book a week ago”）