非谓语做状语的用法：非谓语动词有三种形式：不定式，分词和动名词；不同形式的非谓语动词其作用各有不同，可以作主语、作表语、作状语、作定语、作补足语等。
一、不定式作状语的用法：
1、作目的状语，意为“为了”。例句：To pass the college entrance exam, we must work hard.
2、作结果状语，不定式作结果状语常表示令人意外的结果。例句：I went to see him last night only to find him out.
3、作原因状语，常用在表示情感或态度的形容词后，如“sorry, surprised, disappointed”等，常用结构为“主语+系动词+形容词+to do”。例句：Tom was very happy to see his mother.
二、分词作状语的用法：
1、作时间状语。例句：When completed, the road will be open to the public.
2、作原因状语。例句：Not understanding this, he asked the teacher about it.
3、作条件状语。例句：u Working hard, you’ll succeed.
4、作结果状语，常用现在分词表示自然而然的结果。例句：The fire lasted nearly a month, leaving nothing valuable.
5、表方式或伴随状语：例句：The teacher came into the lab, followed by some students.
三、独立主格结构作状语：名词/代词+非谓语动词。Weather permitting, we will go swimming.