2. 允许某事发生被动语态 基本结构：sth. be allowed 例句：Smoking is not allowed in public places.
3. 允许做某事不加宾语 基本结构：allow doing sth. 例句：The company allows working from home on Fridays.
二、allow for的独特含义 allow for sth. 表示“考虑到、为……留出余地”，提前应对可能出现的情况。1. 预留时间/空间 例句：We should allow for traffic delays when planning the trip.
2. 考虑客观因素 例句：The budget allows for unexpected expenses.
3. 顾及可能性 例句：The design allows for future upgrades.
三、用法对比与常见误区- allow 侧重“给予许可”，直接关联动作执行者或被允许的行为。
- allow for 侧重“预先考虑”，关联潜在因素或不确定条件。
- 错误示例：
❌ The plan allows for students to leave early.应改为 allows students to
✅ The plan allows for unexpected absences.
四、实际应用场景
- 职场沟通：The manager allows flexible working hours but allows for weekly team meetings.
- 旅行规划：We allowed 2 hours for the museum visit, allowing for ticket queues.
- 政策制定：The law allows citizens to protest and allows for peaceful assembly. 五、核心区别 allow 是“ permission许可”的授予，allow for 是“ preparation准备”的考量，二者不可互换。掌握其语义差异，需结合语境判断动作性质——是“批准行为”还是“预留空间”。