什么是 provided that？
provided that 是一个连接词组，用于引导条件状语从句，相当于中文的“只要”、“如果”、“在……条件下”。它常用于正式或书面英语中。
基本结构
主句 + provided that + 条件从句
- You can borrow my car provided that you return it by 6 p.m.
- We’ll go hiking provided that the weather is good.
provided that 与 similar expressions
以下短语在多数情况下可互换使用：
- as long as（更口语化）
- so long as
- on condition that（更正式）
例如：
You may stay out late provided that / as long as / on condition that you call first.
注意事项
- provided that 引导的是真实条件句，通常用一般现在时描述将来情况。
- provided 可单独使用，that 可省略（尤其在非正式文体中）。
- 不要与 providing that 混淆——两者意思相同，但 provided that 更常见。
更多例句
- I’ll help you provided (that) you do your part.
- The offer stands provided that no one else has accepted it.
- You can join the club provided that you’re over 18.