目的状语从句用于表示动作的目的，常见引导词有：so that, in order that, to, so as to 等。以下是主要用法总结：
| 引导词 | 用法说明 | 例句 |
| so that | 后接主语+情态动词或助动词 | He studied hard so that he passed. |
| in order that | 后接主语+情态动词或助动词 | She left early in order that she could catch the train. |
| to | 不带主语，后接动词原形 | He ran to catch the bus. |
| so as to | 不带主语，后接动词原形 | She spoke slowly so as to be understood. |
注意：so that 和 in order that 引导的从句中，通常使用情态动词（如 can, could, may, might）或助动词（如 will, would）。而 to 和 so as to 则直接接动词原形，不带主语。
