1. Infinitives

2. Infinitive:--bare - inf.--
(1) After auxiliary verb
"do , does , did , shall , should, will , would , can , could , may , might , must"
Alice could not find the key.
I will be glad to help you.
(2)After verbs of perception
"see , notice , observe , watch ,hear , feel , smell“
I saw her get on the bus.
He heard her say that.
(3)After "make" & "let’’
His joke made us laugh.
She did not let her sister go to the party.

3. bare - inf.
(4)After "had better" "would rather‘ “would” “should” “would sooner”
You ‘d better think about it.
I ‘d rather wait here a little longer.
Compare “ I ‘d rather you waited here a little longer.,
You should wake up earlier in the morning.
I would sooner not speak to you about his problems because he may not like it.
. (5)After "need" "dare" and "except"
He needn’t do it himself.
Need he do it himself?
She dared not lie to her parents.
Dared she lie to her parents?

4. to - inf.
(1)As a subject
E.g To succeed at my job is all I want at the moment.
To argue with him is a waste of time.
To correct the mistakes which were made by the
students made him angry.
(2) To express an intention
E.g. I go to school to study.
She goes running everyday to lose weight.
(3) In order to join a question & answer in single sentence.
Q:Why did he move to Las Vegas?
A1:He wanted to be closer to the casino.
A2:He moved to Las Vegas in order to be closer to the
casinos.

5. to - inf.
(4) So as ( not) to  join two sentences that relate to the same idea in one sentence.
Eg. She studied very hard for the test. She wanted to be save to pass.
She studied very hard so as to be save to pass the test.

6. to - inf.
(5) Verb + inf.
A few of the more common verbs normally followed by an infinitive include :
afford agree appear attempt decide
determine expect hope like love need
offer pretend seem threaten refuse
We can’t afford to go away this summer.
The room appears to have been searched.
The prisoners attempted to escape but failed.
I managed to pass my finals and become
a graduate

7. All our guesses appeared to be wrong.
I happened to see an old friend of mine the other day.
She seemed to be happy after she was
interviewed.

8. to - inf. (6) Verb + object +inf.
A few of the more common verbs normally followed by an object + an infinitive include:
advise allow ask encourage help invite
know order teach tempt tell warn
compel request wish command forbid persuade
The doctor advised me to take a complete break.
Please allow me to carry that bag for you.
We must appoint a time to meet again.
It is not a good idea compel the students to choose professions they don’t like.
The boy persuaded his father to take him to the funfair.

9. The new amusement centre tempts many people to spend their free time there.
The coach encouraged the players to do their best on the field.

10. to - inf. (7) Adjective followed by infinitive
dangerous important rude good happy
Eg. It is dangerous to walk home alone.
To walk home along is dangerous.
He was happy to hear his son was out of danger
(8) “ Too” and ‘not enough’
Eg, He is too tired to work so he should take some rest.
He is not tall enough to be a policeman.

11. After verbs followed by a question word
Who what which where whom how whether
E.g.*Have you decided where to go for Christmas?
* Do you remember what to buy ?
*She showed me how to make a cake..
*He couldn’t decide whether to learn English or German as a foreign language.