The prices in the country are reported to have risen.

HOW TO SPEAK ON THE INFINITIVE

To see is to believe.

To see is a subject expressed by the Indefinite Infinitive Active used to denote an action simultaneous with that of the finite verb.

Is to believe is a compound nominal predicate which consists of the link verb to be in its Present Simple tense form and the predicative expressed by the Indefinite Infinitive Active.

2. It’s nice to see you here.

To see is a subject with the introductory it expressed by the Indefinite Infinitive Active used to denote an action simultaneous with that of the finite verb.

He is hard to deal with.

Is hard to deal with is a compound nominal predicate which consists of the link verb to be in its Present Simple tense form and the predicative expressed by the adjective easy and Indefinite Infinitive Active.

She started to smile.

Started to smile is a compound verbal aspect (phasal) predicate which consists of the verb to start used to denote the beginning of the action and the Indefinite Infinitive Active.

You can’t have met her there.

Can’t have met is a compound verbal modal predicate which consists of the modal verb can’t used to denote negative deduction (incredulity) and the Perfect Infinitive Active used to refer the action to the past.

I’m glad to have met you there.

To have met is an object expressed by the Perfect Infinitive Active used to denote an action prior to that of the finite verb.

I find it necessary to read this book.

To read is an object with the introductory it expressed by the Indefinite Infinitive Active used to denote an action posterior to that of the finite verb.

The first person to come was my father.

To come is an attribute expressed by the Indefinite Infinitive Active used to denote an action simultaneous with that of the finite verb.

He’s strong enough to lift it.

To lift is an adverbial modifier of reason (cause) expressed by the Indefinite Infinitive Active used to denote an action simultaneous with that of the finite verb.

To tell the truth, I don’t feel very well.

To tell the truth is a parenthesis expresses by an infinitive phrase.

I saw her leave the house.

Her leave is a complex object expressed by the Objective with the Infinitive Construction in which the Indefinite Infinitive Active is in predicate relation to the pronoun in the objective case.

The prices in the country are reported to have risen.

The prices to have risen is a complex subject expressed by the Subjective Infinitive Construction in which the Indefinite Infinitive Active is in predicate relation to the noun in the common case.