不定式是英语语法中的一种形式,由“to”和动词原形构成,可以作为名词、形容词或副词使用。作为名词时,不定式可以作为主语、宾语或表语;作为形容词时,可以修饰名词或代词;作为副词时,可以修饰动词、形容词或副词。
名词
不定式可以用作名词,通常用在句子中作主语、宾语或表语。例如:
- To travel is my dream. (不定式作主语)
- I want to learn English. (不定式作宾语)
- My goal is to become a doctor. (不定式作表语)
形容词
不定式也可以用作形容词,修饰名词或代词。例如:
- I have a book to read. (不定式修饰名词“book”)
- She has no one to talk to. (不定式修饰代词“one”)
副词
不定式可以用作副词,修饰动词、形容词或副词。例如:
- I woke up early to study. (不定式修饰动词“woke up”)
- She is too tired to work. (不定式修饰形容词“tired”)
- He speaks too quickly to understand. (不定式修饰副词“quickly”)