一、核心语义差异
1. **if**
-- 中性条件引导词
-- 仅陈述条件关系（A→B）
-- 例句：If it rains, we'll cancel the picnic.
2. **provided (that)**
-- 具有限制性语义特征
-- 隐含"只有在...条件下才..."（on ...(以上内容有节略,please sign in for more)
主题笔记
word-vs-word-cn
【If】 , 【provided】 are both used to introduce conditional clauses.
When merely a possibility which may or may not be true is expressed, 【if】 is the usual conjunction.
- I'll pay you double 【if】 you get the work finished by Friday.
- We'll have the party in the garden 【if】 the weather's good. 【If】 not (= 【if】 the weather is not good), it'll have to be inside.
- 【If】 anyone calls, just say I'll be back in the office at four o'clock.
- 【If】 she hadn't called, I wouldn't have known.
- I wouldn't work for them (even) 【if】 they paid me twice my current salary.
- We'll deal with that problem 【if】 and when it arises.
- 【If】 disturbed, the bird may abandon the nest, leaving the chicks to die.
When the clause which follows names a stipulation or proviso, 【provided】 (or sometimes providing ) is the usual form.
- We'll buy everything you produce, 【provided】 of course the price is right.
- 【Provided】 that you have the money in your account, you can withdraw up to £100 a day.
