一、基本概念
be permitted to do 表示“被允许做某事”，强调获得许可去做一个具体的动作，结构为被动语态 + 不定式。
doing（动名词）通常表示泛指的动作、习惯或正在进行的行为，在某些动词或介词后使用。
二、语法结构对比
- be permitted to do：主语 + be + permitted + to + 动词原形
例：Students are permitted to use dictionaries during the exam. - doing：常用于 like/avoid/enjoy 等动词后，或作主语/宾语
例：I enjoy reading English novels.
三、关键区别
- 语义重点不同：
be permitted to do强调“许可”；doing强调“动作本身”。 - 结构不同：
permitted后接不定式；而doing是动名词形式。 - 不能互换：例如不能说 “They are permitted using phones”（错误），正确应为 “They are permitted to use phones”。
四、常见错误与纠正
❌ 错误：She is permitted entering the lab.
✅ 正确：She is permitted to enter the lab.
✅ 正确使用 doing：He avoids talking loudly in class.
五、实用例句
- Visitors are not permitted to take photos inside the museum.
- Smoking is not permitted in this building.
- I don’t mind doing the homework again.
- Are we permitted to leave early today?