For example, the verb to stop + Gerund means to finish an action, to interrupt, as for to stop + Infinitive, it means to make a pause in order to do something. That is why the Infinitive after the verb to stop is used in the function of an adverbial modifier of purpose.

He stopped smoking for health reasons.

He stopped to rest for a few minutes

Go on + Gerund means to continue with the action. Go on + Infinitive means to do the next action, or change the activity.

He went on speaking for two hours.

After her early teaching career she went on to become a doctor.

3. Object

Most commonly used verbs followed by the Infinitive are the following: afford, agree, aim, appear, arrange, bother, care, claim, consent, decide, demand, determine, fail, guarantee, hesitate, hope, learn, manage, offer, prepare, pretend, proceed, promise, propose, refuse, resolve, seek, strive, swear, threaten, trouble, undertake, volunteer, vow.

The Infinitive may also be used as an object after an adjective. The most commonly occurring of them are: amazed, delighted, lucky, relieved, afraid, disappointed, sad, anxious, determined, shocked, ashamed, eager, pleased, astonished, fortunate, prepared, surprised, careful, glad, proud, sorry, certain, happy, ready, upset, content, hesitant, reluctant, willing, pleased, interested, etc.

Note: Sometimes the introductory object it is used.

He found it difficult to spot her in the crowd.

4. Attribute

The Infinitive in this function may modify nouns, substantivized adjectives, pronouns, numerals.

This is much to ask.

England, once «the workshop of the world», was the first to become a highly developed industrial country.

Hope is the last to die.

When we go out, he’s always the one to pay.

5. Adverbial modifier

The Infinitive can be used as an adverbial modifier of purpose, subsequent events, consequence, attendant circumstances, comparison, condition, exception, time, cause, or motivation [Кобрина, Корнеева, 2009].

Adverbial modifier of purpose. Indefinite forms of the Infinitive (both active and passive) are used in this function. The Infinitive may be preceded by the conjunction in order, so as or by limiting particle (just, only):

We all need stress in order to achieve and do our best work.

They never parked the big van in front of the house so as not to upset the neighbours.

Adverbial modifier of subsequent events or attendant circumstances. In this function the Infinitive denotes an action that follows the one denoted by the predicate. The Infinitive may be preceded by the particles only, merely, simply [Н. А. Кобрина, Е. А. Корнеева и др., 2009].

He left his home town, never to come back.

I tore open the box, only to discover that some of the parts were missing. I went to see the doctor, only to find him absent.

Adverbial modifier of result. In this function the Infinitive is used after adjectives and adverbs modified by too; enough; so …. as, and nouns modified by such.… as.

I was too afraid to try bungee jumping.

No man is clever enough to know all the evil he does.

Would you be so kind as to send to me those documents?

Trade policy needed to be organized in such a way as to contribute to sustainable economic development.

Adverbial modifier of comparison or manner. In this function the Infinitive is introduced by the conjunctions as if, as though or than.