how can we i identify if the infinitive is used as a noun,adjective and adverb?
If it answers the question What?, it's a noun.Originally Posted by Unregistered
If it answers the question How?, When?, Where? or Why?, it's an adverb.
Noun: To err is human.
Test: What is human?
Adverb: He broke the window to unlock the door.
Test: Why did he break the window?)
If you put the verb BE (is, are, was, were) before it, and the sentence sounds OK, then it's an adjective.
Adjective: We want you to eat.
Test: You are to eat.