染雾I am very glad to hear it.
The question is difficult to answer.
“too + 形容词或副词 + 不定式”作状语。如：
He is too old to do that.
另外，句子中有enough这个词时，常用不定式作状语。例如：
The room is big enough to hold us.
6)作表语。如：
My job is to help the patient.
7)作独立成分。如：
To tell the truth, I don’t agree with you.
8)不定式与疑问词who，which，when，where，how，what等连用，在句中起名词作用，可充当主语、表语、宾语
