Rules
What is the form of infinitives?
To + verb
When infinitives act as nouns, they answer the question
what
What is the infinitive in this sentence?
I had too many books to carry.
to carry
to
When infinitives work as adjectives they modify as what
a noun
What is the infinitive in this sentence?
He arrived too late to see the actors.
to see
If a common expression ends with a preposition, then it may be followed by a
gerund
When infinitives work as adjectives, they modify a what in the sentence?
a noun
What is the infinitive in this sentence?
There isn't enough snow to ski on.
to ski