引言
在英语学习中，动词 spend（花费）常与介词搭配使用，其中最常见的是 spend on 和 spend in。虽然两者都表示“花费”，但它们的用法和语境有明显区别。本文将通过结构、例句和注意事项，帮助你准确掌握这两个短语。
1. spend on 的用法
spend on 通常用于表示“把钱或时间花在某物或某事上”，强调花费的对象是具体的物品、活动或目的。
• I spent $50 on books.
• She spends a lot of time on her homework.
• They spent their savings on a new car.
• She spends a lot of time on her homework.
• They spent their savings on a new car.
结构：spend + 金钱/时间 + on + 名词/代词
2. spend in 的用法
spend in 较少见，主要用于表示“在某个地方度过时间”或“在某种状态中花费时间”。它强调的是地点或状态，而非具体对象。
• He spent the summer in Paris.
• We spent two hours in silence.
• Children should not spend too much time in front of screens.
• We spent two hours in silence.
• Children should not spend too much time in front of screens.
注意：这里的 in 是介词短语的一部分（如 in Paris, in silence），而不是直接跟在 spend 后构成固定搭配。严格来说，“spend in + 动名词”在现代标准英语中并不常用。
3. 常见误区
许多学习者误以为可以说 “spend in doing something”，但实际上，正确表达应为：
✅ I spent two hours on reading.
✅ I spent two hours reading. （更自然）
❌ I spent two hours in reading. （不地道）
✅ I spent two hours reading. （更自然）
❌ I spent two hours in reading. （不地道）
在表示“花时间做某事”时，英语更倾向于使用 spend time (in) doing something，但 in 通常可以省略，且现代英语中常直接用动名词：
• She spent the whole day gardening.
• They spent weeks preparing for the exam.
• They spent weeks preparing for the exam.
4. 总结对比
| 结构 | 含义 | 示例 |
|---|---|---|
| spend + 时间/钱 + on + 名词 | 花钱/时间在某事上 | He spent $100 on shoes. |
| spend + 时间 + 动名词 | 花时间做某事（更自然） | She spent hours studying. |
| spend + 时间 + in + 地点/状态 | 在某地/某种状态中度过时间 | They spent the weekend in the mountains. |
5. 小测验（自测）
判断以下句子是否正确：
- I spent a lot of money on my new phone. ✅
- She spent two hours in watching TV. ❌（应去掉 in）
- We spent our vacation in Hawaii. ✅