Use of Infinitive
A Infinitive is not limited by person and number as a verb that has a subject.
(1) Verbs such as learn, remember, promise, swear, conset, neglect, refuse, purpose, try, endeavour,
attempt, fail, care, hope, decide, hesitate, prepare, determine, undertake, manage, arrange, seem,
forget, agree, regret etc. are followed by infinitive.
Examples :- We endeavour to invite such persons.
We promise to do this work soon.
(2) Verb such as order, tell, invite, oblige, allow, permit, compel, teach, instruct, temp, advise, encourage,
urge, request, show, remind, forbid, warm etc. are followed by object and infinitive.
Examples :- The teacher instructed the students to go.
She told me to come there.
(3) Verbs or expressions like- will, can, do, must, may, let are followed by infinitive without to.
Examples :- Let him do this work.
Let it be done.
(4) Expressions like would rather, would sooner, rather than, sooner than, had better are followed by
infinitive without to.
Examples :-You had better tell him.
I would do rather than suffer.
(5) See can be used with infinitive or without it.
Examples :- Go to see him.
\ Go and see him.
(6) The infinitive is used after adjectives like- delight, angry, glad, astonished, surprised, horrified,
disappointed etc.
Examples :- I was astonished to find him.
I was horrified to see the scene.
(7) The verb know is never directly followed by the infinitive. It is followed by a conjunction and
then the infinitive.
Examples :- Do you know to play the harmonium.(False)
Do you know how to play the harmonium.(True)
(8) ...had better is always followed by the infinitive without to.
Examples :-You had better to stop taking the medicine which has harmful side-effects.(False)
You had better stop taking the medicine which has harmful side-effects.(True)
(9) Infinitive is not used with to after verbs of perception like- to see, to hear, to feel, to watch etc.
Examples :- I saw him cross the street.
She heard her come downstairs.
(10) Avoid using split-infinitive.
Examples :- He planned to not go on a vacation this year.(False)
He planned not to go on a vacation this year.(True)
(2) Verb such as order, tell, invite, oblige, allow, permit, compel, teach, instruct, temp, advise, encourage,
urge, request, show, remind, forbid, warm etc. are followed by object and infinitive.
Examples :- The teacher instructed the students to go.
She told me to come there.
(3) Verbs or expressions like- will, can, do, must, may, let are followed by infinitive without to.
Examples :- Let him do this work.
Let it be done.
(4) Expressions like would rather, would sooner, rather than, sooner than, had better are followed by
infinitive without to.
Examples :-You had better tell him.
I would do rather than suffer.
(5) See can be used with infinitive or without it.
Examples :- Go to see him.
\ Go and see him.
(6) The infinitive is used after adjectives like- delight, angry, glad, astonished, surprised, horrified,
disappointed etc.
Examples :- I was astonished to find him.
I was horrified to see the scene.
(7) The verb know is never directly followed by the infinitive. It is followed by a conjunction and
then the infinitive.
Examples :- Do you know to play the harmonium.(False)
Do you know how to play the harmonium.(True)
(8) ...had better is always followed by the infinitive without to.
Examples :-You had better to stop taking the medicine which has harmful side-effects.(False)
You had better stop taking the medicine which has harmful side-effects.(True)
(9) Infinitive is not used with to after verbs of perception like- to see, to hear, to feel, to watch etc.
Examples :- I saw him cross the street.
She heard her come downstairs.
(10) Avoid using split-infinitive.
Examples :- He planned to not go on a vacation this year.(False)
He planned not to go on a vacation this year.(True)
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