Grammar: Verbs: [ to + infinitive ]
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We use the to-infinitive:

► to express purpose (to answer "#Why...?"). For example:

- He bought some flowers to give to his wife.
- He locked the door to keep everyone out.

✚ We sometimes say #in_order_to or #in_order_not_to:

- We set off early in order to avoid the traffic.
- They spoke quietly in order not to wake the children

✚ … or we can say #so_as_to or #so_as_not_to:

- We set off early so as to avoid the traffic.
- They spoke quietly so as not to wake the children.

► after certain verbs, particularly verbs of #thinking and #feeling:
[choose, decide, expect, forget, hate, hope, intend, learn, like,
love, mean, plan, prefer, remember, want, would like, would love]

… and verbs of #saying:
[agree, promise, refuse]
For example:
- They decided to start a business together.
- Remember to turn the lights out.

✚ Some verbs are followed by a #direct_object and the infinitive:
[advise, ask, encourage, invite, order, persuade, remind, tell, warn,
expect, intend, would prefer, want, would like]
For example:
- She reminded me to turn the lights out.
- He encouraged his friends to vote for him.

► after certain #adjectives.

✚ Sometimes the to-infinitive gives a reason for the adjective:
[disappointed, glad, sad, happy, anxious, pleased, surprised, proud, unhappy] 
For example:
- We were happy to come to the end of our journey
= We were happy because we had come to the end of our journey
- John was surprised to see me
= He was surprised because he saw me

✚ Other adjectives with the to-infinitive are:
[able, unable, due, eager, keen, likely, unlikely, ready, prepared, unwilling, willing]
For example:
- Unfortunately I was unable to work for over a week.
- I am really tired. I’m ready to go to bed.

✚ We often use the to-infinitive with these adjectives after it to give #opinions.
[difficult, easy, possible, impossible, hard, right, wrong, kind, nice, clever, silly, foolish]
For example:
- It’s easy to play the piano, but it’s very difficult to play well.
- He spoke so quickly it was impossible to understand him.

✚ We use the preposition #for to show who these adjectives refer to.
[difficult, easy, possible, impossible, hard]
For example:
- It was difficult for us to hear what she was saying.
- It is easy for you to criticise other people.

✚ We use the preposition #of with other adjectives. For example:

- It’s kind of you to help.
- It would be silly of him to spend all his money.

 ► As a #postmodifier after abstract nouns like: [ability, desire, need, wish, attempt, failure, opportunity, chance, intention] For example:
- I have no desire to be rich.
- They gave him an opportunity to escape.
- She was annoyed by her failure to answer the question correctly.

►  We often use a to-infinitive as a postmodifier after an indefinite pronoun [somebody, someone, something, anybody, anyone, anything, nobody, no one , nothing, everybody, everyone, everything] For example:

- When I am travelling I always take something to read.
- I was all alone. I had no one to talk to.
- There is hardly anything to do in most of these small towns.
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