English practice in grade seven is urgent.

Imperative sentences are used to express orders, requests, suggestions, warnings, prohibitions, etc. It is called imperative sentence. Imperative sentences are most commonly used to express commands, so they are often called imperative sentences in school grammar.

Imperative sentences are usually omitted because the object (that is, the subject) is the second person. The verbs in imperative sentences are all simple present tense, and the end of the sentence is indicated by a period.

Example:

Go wash your hands.

Go wash your hands. -command)

Be quiet,please. Please be quiet. )

Be quiet,please. -Request)

Be kind to our sister.

Be kind to your sisters. -Recommendation)

Watch your step.

Watch your step. -Warning)

Watch out! Danger!

(Be careful! Danger! -a strong warning, such as an exclamation)

Please don't trample on the lawn.

Don't mow the lawn. -Prohibited)

No parking.

No parking. -Prohibited)

Don't eat or drink.

(no eating or drinking. -Prohibited)

No littering.

(No littering. -Prohibited)

Imperative sentences often indicate the subject "you", which mainly emphasizes the object and determines the object.

For example:

You tell him, Chris. (Chris goes to tell him. )

Related password

Imperative sentences have no subject, and the subject you is often omitted;

The prototype of the verb is the predicate, so don't add negative changes at the beginning of the sentence;

Use a falling tone when reading aloud, and put an exclamation mark at the end of the sentence.

form of expression

● Positive structure:

1.Do type (i.e. verb prototype (+object)+other components). Please sit down here. Please sit here.

Some imperative sentences can be omitted when the meaning is clear. This way, please Please go this way. This way, please

2.Be type (that is, Be+ predicative (noun or adjective)+other components). Be a good boy! Be a good boy!

3.Let type (that is, Let+ object+verb prototype+other components). Let me help you. Let me help you.

● Negative structure:

The negative expression of 1 Do and Be are both formed by adding don at the beginning of the sentence:

For example:

Don't forget me! Don't forget me!

Don't be late for school! Don't be late for school!

If it is a systematic structure, that is, a structure with no action verbs and only adjectives, don‘t be can be used.

People with behavioral verbs can't use it like this, they can only use don't.

2. There are two negative forms of let: "don't +Let+ object+verb prototype+other components" and "Let+ object +not+ verb prototype+other components".

Don't let him go. /Tell him not to go. Don't let him go.

3. some can start with no, which is used to express forbidden imperative sentences. No smoking! No smoking! No fishing! No fishing!

"Rang" imperative sentence

The imperative sentence guided by "let" is a common verb sentence pattern, and its main usage is as follows:

1. means "suggestion".

The "let" in this sentence pattern is followed by the first person pronoun object.

For example:

（ 1）

Let's get started.

Let me look for it.

This sentence is euphemistic and more polite than the direct imperative sentence. Compare (4)a and (4)b:

Don't disturb him.

B.let's not disturb him.

(a) It's a direct order, with a strong tone, not as gentle as (b).

2. Express "indirect orders" or "wishes".

The verb object in this sentence is a third-person noun or pronoun.

For example:

Put Robert in charge of the marketing department.

Let her join our choir.

3. Express "warning", "contempt" and "threat".

The object in this imperative sentence is also dominated by the third person. In addition to the fierce tone, there is sometimes irony.

For example:

Let him try, and he will expose the problem that he can't work independently.

Let the invaders come, and our armed forces will destroy them immediately.

When using the imperative sentence "let", we must pay attention to the following points:

First of all, the negative sentence of "let" is. Secondly, if the object is the third person, use "Don't let". . 。” (See Example (9)); If the object is the first person, use "let ... not" (see example (10)):

Don't let this happen again.

It is raining now. Let's not go out until after the rain.

Second, "Rang" only applies to the present tense and can have passive voice.

For example:

(1 1) Put recalcitrant criminals in jail.

(12) Promote all dedicated and capable employees.

Thirdly, "Let" is followed by an infinitive without "to", or it can be some appropriate adverbs, such as out, in, down, alone and so on.

（ 13）

Open the window and let in fresh air.

The sun is shining in the room. Put down the blinds.

Please leave me alone.

Fourth, when using "let's", it includes the target of the speaker; When "let's" is used, it does not include the other party.

For example:

Let's have a try, shall we?

Let us do it ourselves, shall we?

It is not difficult to know from "shall we" in (17) and "will you" in (18) that the former includes the hearer, while the latter does not. Imperative sentences express requests, orders, suggestions, etc. Predicate verbs always use the original form. Sentences usually have no subject, and there is an exclamation point or a period at the end of the sentence, falling tone.

Second person subject imperative sentence

Be careful! Watch out!

Don't make such noise. Don't be so noisy.

Affirmative imperative sentence

A. sentence pattern: verb prototype ~. (omit the theme)

Stand up. Stand up.

Be quiet,please. Be quiet,please.

B. Sometimes, do can be added before verbs in order to strengthen the mood.

Please sit down.

Be sure to sit down.

Be sure to study hard.

You must study hard.

compare

Imperative and declarative sentences:

You sit down.

You sit down.

Imperative sentence:

Sit down.

Sit down (omit your topic)

C. When expressing imperative sentences in a polite tone, please can be added at the beginning or end of the sentence, but if please is added at the end of the sentence, a comma must be added before please.

This way, please

This way, please.

D if there are occupations in imperative sentences, they must be separated by commas and placed at the beginning or end of the sentence.

Li Ming, come here.

Li Ming, come here.

Come here, Li Ming.

Come here, Li Ming.

Negative imperative sentence

Sentence pattern: don't+verb prototype ~

Do not swim in the river.

Do not swim in the river.

Don't be late.

Don't be late.

Please don't make any noise.

Please don't make any noise.

pay attention to

"No+ noun/gerund" can also be used to indicate prohibition, especially slogans.

No smoking!

No smoking!

No parking!

No parking!

No entry!

No entry!

Don't litter!

No littering!

Sentence pattern conversion

Rewrite imperative sentences and declarative sentences

1. imperative sentence = you must ... (declarative sentence)

Come here. Come here.

You have to come here.

You must come.

Don't do that again.

You can't do that again.

2. please+imperative sentence = do you want to (please) ~? (declarative sentence)

Please help me. Please help me.

Would you help me?

Will you help me?

Please come here on time. Please be here on time.

Would you please come here on time?

Would you please arrive on time?

3. Imperative sentences with first and third person subjects

Let's say goodbye here.

Let's say goodbye here.

Don't let him do that again.

Don't let him do that again. ..

1. Positive imperative sentence

Sentence pattern: let+ first person (me, us) ~.

Let+ third person pronoun (objective: he, she, it, them) or noun ~.

Let's go at once.

Let's start at once.

Let me try that one more time.

Let me try that one more time.

Let Tom go there by himself.

Let Tom go there by himself.

pay attention to

Let us be tolerant of each other, and let us not be tolerant of each other. It is most obvious when using interrogative sentences.

Let's go, shall we?

Let's go, shall we?

Let's go, shall we?

Let's go, shall we? (Ask for the other party's opinion)

2. Negative imperative sentences

Sentence pattern: let's (we, me) +not+ verb prototype ~

Don't let+third person pronoun or noun+objective case of verb prototype.

Let's not say anything.

Let's not say anything.

Don't let them play with fire.

Don't let them play with fire.

Sentence pattern conversion

The imperative sentence is sometimes a conditional adverbial clause guided by "if".

Imperative sentence: Use your head and you will find a way.

Conditional sentence: If you use your head, you will find a way.

pay attention to

Answer the question of let's with Yes, let‘s ~. No, we don't.

The method of transforming imperative sentences into interrogative sentences;

The form of interrogative sentence after imperative sentence

A, let's means that the speaker makes suggestions to the other party, the subject of short answer questions is expressed by we, and the interrogative questions are expressed by shall we or shan‘t we.

For example:

Let's have a cup of tea, shall we

B, let me or let us show that the listener makes a request, and the question is whether you are willing or not.

Give me a break, will you?

C, you can add a short question after other imperative sentences to make the tone more polite.

For example:

Take a break, okay?

Stand up, will you?

English usage

Imperative sentences are used to express requests, commands, etc. There is no subject in the sentence, the positive form is composed of predicate or predicate+object (+object complement), and the negative form is preceded by Don‘t 't. [ 1].

Please stand up. Please stand up.

Don't worry. Don't worry.

Usage of can:

Can is a modal verb, meaning "can, will, can, be allowed, etc." , followed by the verb prototype, the negative form is can, which can be abbreviated as can' t.

She can speak Japanese. She can speak Japanese.

I can't remember his name. I don't remember his name.

Can you spell your name? Can you spell your name?

Special usage of imperative sentences

Imperative sentences are sometimes equivalent to conditional adverbial clauses guided by if.

For example:

Study harder and you will catch up with the rest of the class.

Study hard and you will catch up with other students in your work.

If you study harder, you will catch up with other students in the class.

If you study harder, you will catch up with other students in the class.