什么是 “need something to do something”？
“Need something to do something” 是英语中一种常见的结构，用于表达“需要某物来完成某事”。 这里的 something 通常是工具、材料、条件等，而 to do something 是不定式短语，表示目的。
I need a pen to write a letter.
（我需要一支笔来写信。）
语法结构解析
基本结构为：
- 主语 + need + 名词/代词 + to + 动词原形 + ...
注意：这里的不定式（to do）表示目的，不是宾语补足语。
She needs more time to finish the project.
They need clean water to cook.
They need clean water to cook.
常见误区
- 不要混淆 “need to do” 和 “need something to do”：
“I need to study”（我需要学习）vs “I need a book to study”（我需要一本书来学习）。 - 不定式不能省略 to：
❌ I need a knife cut the apple.
✅ I need a knife to cut the apple. - 不要误用动名词：
❌ I need a computer for working.
✅ I need a computer to work.
实用例句
- We need volunteers to help organize the event.
- He needs a quiet place to concentrate.
- You’ll need your ID card to enter the building.
- The plant needs sunlight to grow.
- I need some advice to make the right decision.
小测验（JavaScript 交互）
判断以下句子是否正确：