The rules for an infinitive is:
(1) Noun forms include infinitives.
(2) Use of an infinitive is not appropriate if a preposition follows the verb.
(3) An infinitive may follow a common statement that ends with a preposition.
In the given question we have to wrote the rules for an infinitive.
There are certain fundamental guidelines for using infinitives.
(1) Noun forms include infinitives. They are the verb's subject if they are used before the main verb; if they are used after the main verb, they are the verb's object.
(2) Use of an infinitive is not appropriate if a preposition follows the verb.
(3) An infinitive may follow a common statement that ends with a preposition.
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