词汇

grammar_british-grammar_clause-types

释义

Clause types

There are four basic types of main clause: declaratives (statements), interrogatives (questions), imperatives (orders/instructions) and exclamatives (used for exclamations).

In the examples below, x is any other element in the clause (e.g. object, predicative complement):

Declarative clauses

Declarative clauses most commonly function as statements. The usual word order is subject (s) + verb (v) + x. Declaratives can be affirmative or negative. They make statements about how things are and how they are not.

affirmative	negative
[S][V]I saw[X]them last week.	[S]I[V]didn’t see[X]them last week.
[S]Some courses[V]begin[X]in January.	[S]Some courses[V]don’t begin[X]until March.

Sometimes we use declaratives as questions or requests:

A:
Those are the only tickets left? (question)

B:
Yes, just those two.

A:
You could pass me the spoon. That would be helpful. (request)

B:
This one?

Interrogative clauses

Interrogative clauses most commonly function as questions. The usual word order is (wh-word) + auxiliary/modal verb (aux/m) + subject + verb + x:

What [AUX] [S]are you[V]doing?

[AUX]Does[S]she[V]play[X]tennis well?

[M]Can[S] [V]I come[X]with you?

Interrogative clauses can be affirmative or negative.

affirmative	negative
Are there any blue ones?	Aren’t there any blue ones?
Why did he tell me?	Why didn’t he tell me?

Imperative clauses

Imperative clauses most commonly function as commands, instructions or orders. The usual word order is verb + x. We do not usually include the subject in an imperative clause. We use the base form of the verb:

Come on. Hurry up!

Leave me alone!

Let’s go.

Put it in the microwave for two minutes.

Imperative clauses can be affirmative or negative. We make negative imperatives with auxiliary verb do + not. The contracted form don’t is very common in speaking:

affirmative	negative
Go!	Don’t go!
Leave the door open.	Don’t leave the door open.
Be happy.	Don’t be sad.

We use do not in more formal contexts:

[instructions on a jar of coffee]

Do not make coffee with boiling water.

We can use the short form don’t as an imperative answer, or as a reaction to something:

A:
Shall I open the window?

B:
No, don’t. I’m freezing. (No, don’t open the window.)

Imperatives with subject pronoun

Sometimes we use you (subject pronoun) with an imperative clause to make a command stronger or to strengthen a contrast. It can sometimes sound impolite:

Don’t you ever read my letters again.

[talking about washing up dishes]

You wash, I’ll dry.

In informal speaking, we can use an indefinite subject (e.g. someone, somebody, no one, nobody, everyone, everybody) with an imperative:

No one move. Everyone stay still.

Invitations

We often use an imperative to make an offer or invitation:

Have some more cake. There’s plenty there.

Imperatives with do

We sometimes use do for emphasis in an imperative clause, especially if we want to be very polite:

Do sit down, please.

Imperatives with let

Spoken English:

In speaking we usually use let’s for first person plural imperatives (us) to make a suggestion. In more formal situations we use let us:

Let’s go and eat.

Now, let us all get some sleep. (more formal)

For third person imperatives (him, her, it, them) we form an imperative clause with let:

A:
Mr Thomas is here to see you. Shall I send him in?

B:
Let himwait. I’m busy.

Exclamative clauses

Exclamative clauses usually have one of the following word orders:

What + noun + subject + verb

How + adjective or adverb + subject + verb

Auxiliary or modal verb + subject + verb (i.e. interrogative word order)

We use exclamative clauses most commonly to express surprise or shock. In writing we use an exclamation mark:

What a lovely sister you are!

How beautiful that house was!

Wasn’t she great!

Didn’t he sing well!

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