INFINITIVE

Infinitive has two kinds: To Infinitive and Bare Infinitive

A.    The Use of To Infinitive

1.      As Subject

Example:

§  To say is easy but to do is difficult

§  To understand somebody needs time

2.      As Noun Modifier

Example:

§  He took a chair to sit

§  The beggar has nothing to eat

3.      As Adjective modifier

Example:

§  The lesson is easy to learn

§  She was sad to hear the terrible news

4.      As Verb Modifier

Example:

§  John went to buy a ticket

§  The president was invited to open the conference

5.      As WH question Modifier

Example:

§  He asked me how to overcome the case

§  I don’t know what to do

Some verbs must be followed by to infinitive

Advice     intend              warn                ask

Allow       invite               want                beg

Learn       tell                   mean                wish

Decide     need                teach                expect

Permit      force                force                promise

Hope        purpose

Example:

§  He wants to go          => S + V + To infinitive

§  He wants me to go    => S + V+ O + To Infinitive

B.     The Use of Bare Infinitive

1.      After Modal

Example:

§  He will buy a villa

§  You should struggle hard

2.      After some Perception Verbs and Causative Form, except in passive form

Example:

§  She saw the boy steal money

§  He makes us work hard

Some verbs can be followed by bare infinitive

Help          observe            see

Have          watch              hear

Make         look at             feel

Let             notice

Know        listen to

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