The Infinitive is a non-finite verb form which names a process or an action. The Infinitive is the base form of the verb. We use it with particle to or without to.
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1. We usually use infinitives (to + verb) and negative infinitives (not to + verb) with to (full infinitive):
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○ after verbs
| · We agreed to meet on Friday.
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○ with equivalents of
modal verbs: be able
to, be allowed to, be
permitted to, be to,
have to, ought to
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· We aren’t allowed to park here.
· They are to arrive at p.m.
· You have to fill in a form.
· Children ought to help their old parents.
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○ with be going to,
be about to, used to
| · We are going to buy a notebook.
· The game is about to start.
· There used to be a gas station here.
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○ with verb + object
| · Theyexpect us to arriveat seven.
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○ after for+ object
| · We’ve arranged for you to visit our head office.
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○ with nouns
| · You madea promise not to tellanyone.
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○ after indefinite pronouns
| · I’m looking for someone to help me.
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○ with adjectives
| · Are youready to gonow?
· I’m happy to be here.
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○ after question words
| · Do you know where to go?
· I wasn’t sure about what to do and what not to do here.
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2. We usually use infinitives and negative infinitives without to (bare infinitivesi.e.base form of the verb)after:
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○ modal verbs:
can, could, may,
might, must, needn’t,
shall, should, will,
would
| · I can’t stay long.
· We could go to a night club.
· I must speak to the manager.
· Sarah will be away for three days.
· It might rain later.
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○ perception verbssuch
as hear + object and
see + object
| · I didn’t hear Tom come in.
· I’ve never seen anyone eat as much as our friend can.
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○ had betterand
would rather
| · I’d better do it tonight, although I’d rather go out.
· It’s late. You’d better weara coat.
· I’d rather listen to Elvis than the Beatles.
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○ the verbs let + object
and make + object
| · Please make her stop.
· They won’t let us leave.
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3. After the verb help, we can use an infinitive with or withoutto.
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| · Annyhelpedme(to) clean up.
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4. We usually leave out the second to when we join two infinitives with and or with or.
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| · Brian just wants to sit and ___ watch videos all day.
· Do they intendto buy a flat or ___ rent one?
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5. We can use to or not to alone instead of repeating a verb or clause. But we don’t leave outthe verb be.
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| · Would you like to play? – I’d love to.___
· I was hoping to go with you, but I decided not to. ___
· Was Michael happy? – He seemed to be. (Not: He seemed to.)
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6. We can also use infinitives to express purpose (= in order to).
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| · He only did it to get attention. (= He only did it in order to get attention.)
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7. We can use infinitives in clauses with objects, prepositional phrases and adverbs. We don’t usually put adverbs between to and the verb (a split infinitive) unless it is for emphasis.
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| · I want to (really) understand Islam.
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Used to do
| Be / Get used to doing
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Used to + Infinitivemeans that something happened regularly or went on for a time in the past.
| Be / Get used to + ing formmeans that something is familiar and is no longer strange.
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· I used to travel. (Means that in the past I regularly travelled, but I no longer do so.)
· We used to play that game when we were younger.
· I used to like fish but I never eat it now.
· There used to be a dancehall here, but they knocked it down.
| · I’m used to travelling. (Means that travelling is no longer strange or difficult because I have done it for so long.)
· We’re used to getting upearly. We do it every day.
· Sarah is used to working late at the office.
· Most visitors in Britain are used to driving on the left.
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We usually use didn’t use to in negatives and did... use to in questions.
| We can also say get used to talk about things becoming more familiar.
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· We didn’t use to have computers. OR
· We never used to have computers.
· Where did people use to buy their food before the supermarket was build?
· Did you use to live in New York?
| · It was difficult at first, but Mike soon got used to working at night.
· After her husband died, the old woman hadtoget used to living on her own.
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