A form of the verb. In the verb phrase the infinitive has two forms:
 The verb stem: This form of the infinitive is used after Modal Auxiliary verbs such as must and should:
Life must go on.
Modal Auxiliary Infinitive.
 ‘To’ plus the verb stem:
I would like to meet these people.
Verb verb Infinitive.
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Certain Transitive verbs can have two objects:
 A direct object.
 An indirect object.
For example:
We gave them an early Christmas present.
She told me the story.
Subject verb Indirect object Direct object.
As the examples show, the two types of object convey a different meaning. The indirect object tells us about the person or thing that benefits from the action described by the verb: they received the early Christmas present;/heard the story.
Verbs which commonly have an indirect object as well as a direct one include:
Bring Buy Give Promise
Send Show Teach Tell.
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The imperative is the form of the verb used to make commands:
‘Go away!’ cried Mary.
It consists of the stem of the verb. Imperative clauses have a special form. They resemble a normal clause, but there is no subject. In effect the subject is you, but it is not stated:
‘(You) go away!’ cried Mary.
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A subordinating conjunction used to introduce conditional clauses.
It can also be used:
 With what to form questions about things that might happen in the future or might have happened in the past:
What if I find certain issues or situations difficult?
What if he had become much more ruthless in that time?
 To modify an adjective or adverb:
It was a delicious, if small, compensation.
Trade unions began, if slowly and unadventurously, to assert that they didn’t give a hoot.
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Some compound words are linked by a hyphen. There is no simple rule to help know which compounds need hyphens and which do not. Hyphens are, however, being used less and less, especially in compound nouns. People tend to write website rather than website, and air raid instead of air-raid. Hyphens are still often used:
 To form a verb from a compound noun:
A booby trap
The area was heavily mined and booby-trapped.
 To form a noun from a phrasal verb or prepositional verb:
I don’t want you to build up your hopes and then be let down.
A build-up of harmful gases.
 To form a word with a prefix:
Co-opt multi-storey post-war.
 To form some compound adjectives:
Easy-care head-on right-handed.
Don’t use a hyphen between the two parts of a phrasal verb:
Time to top up your mobile phone.
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