We can use the to-infinitive after too and enough.
We can combine two sentences into sentence using too+ adjective/adverb + to-infinitive.
Anil is very weak. He cannot lift the weight.
Anil is tooweak to lift the weight.
My sister is very young. She cannot go to school.
My sister is too young to goto school.
The coffee is very hot. We cannot drink it.
The coffee istoo hot to drink.
Note: that the to-infinitive in the last example (“to drink”), though active in forms, is passive in meaning. Here the action expressed by to-infinitive is not performed by the subject of the main verb .In such cases,for noun/pronoun can be placed before the to-infinitive:
The coffee is too hot (for us) to drink.
We can combine two sentence into one sentence using adjective/adverb + enough+ to-infinitive. Enough has a positive sense, while too has a negative sense.
Satish is very strong. He can lift the weight.
Satish is strong enough to lift the weight.
You are quite old. You ought to know better.
You are old enough to know better.
The bag is quite light. I can carry it.
The bag is light enough to carry.
The to-infinitive in the last example is passive in meaning. For + noun/pronoun may be introduced in such cases.
The bag is light enough (for me) to carry.