“ask for” 是英语中常见的动词短语，表示“请求、要求、索要”。以下是其主要用法和例句总结：
| 用法 | 释义 | 例句 |
| ask for something | 请求某物 | I asked for a glass of water. |
| ask for help | 请求帮助 | She asked for help with her homework. |
| ask for permission | 请求许可 | He asked for permission to leave early. |
| ask for someone’s opinion | 询问某人的意见 | I asked for your opinion on the plan. |
使用时注意，“ask for”后接名词或代词，不可直接接动词原形。例如：正确说法是“ask for advice”，而不是“ask for to advice”。
总之，“ask for”常用于表达请求或索取，是日常交流中的实用短语。
