A group of words that makes complete sense is called a sentence.
They are four in kind. They are;
1. ASSERTIVE OR DECLARATIVE SENTENCE:
This sentence declares or asserts something. This can be divided into two types.
1A
Affirmative or Positive Declarative Sentence:
It tells the presence of something.
Eg:
Every act of my friend is very reasonable.
1B
Negative or Negative Declarative Sentence:
It tells the absence of something.
Eg:
No act of my friend is without reason.
2.INTERROGATIVE SENTENCE:
An interrogative sentence asks a question. These are followed by a mark of interrogation. These sentences seek some sort of information. Like Declaratives this is in two types.
Positive Interrogative Sentence:
Eg:
Why do you go to school? ( wh-question)
Eg:
Is he ready? (yes-no question)
Negative Interrogative Sentence:
Eg:
Why do you not go to school? ( wh-question)
Eg:
Is he not ready? (yes-no question)
To know different variations in Interrogative Sentences, the below details will help you to understand better.
With who, whose, whom, what, which. (Interrogative pronouns)
Eg:
Who will help me?
With what, which, whose. (Interrogative Adjectives)
Eg:
Whose pencil is this?
With where, when, why, how. (Interrogative adverbs)
Eg:
Where does she go?
With am, is, are, was, were, do, does, did, have, has had. ( Helping verbs)
Eg:
Am I clear?
Do you go to the market every day?
Have you finished your tasks?
With can, could, may, might, will, would, shall, should, must, ought to, used to, need, dare. (Modal verbs)
Eg:
Can you lift this bag?
With the mark of exclamatory at the end of the sentence. ( These sentences expect the speaker's agreement, rather than information).
Eg:
Hasn't he grown up!
Isn't it a horrible experience!
With the tags. ( These tags along with the mark of interrogation adding to a declarative sentence is called question tag. It is only to confirm the information, rather than seeking the information).
Eg:
He is a teacher, isn't he?
They are not innocent people, are they?
With the alternative ideas in a sentence. ( It takes the conjunction or in the question. We can consider any choice from the question as our answer).
Eg:
Is your uncle going to Hyderabad or Warangal?
With the rhetorical idea in a sentence. ( Though this sentence ends in the mark of interrogation, it does not expect any answer from the speaker.
Eg:
Why should I do this?
Who am I to help you?
Sometimes a declarative sentence can be considered as an Interrogative sentence. This happens when we reflect on a tone, the way we ask a question.
Eg:
The children are no longer going to school?
3. IMPERATIVE SENTENCE:
Imperative Sentences give commands, orders, requests, suggestions, desires or instructions.
In an imperative sentence the subject You is understood.
Eg:
Finish the work as early as possible. (Positive Imperative)
Eg:
Don't finish the work as early as possible. (Negative Imperative)
Observe the word order in negative imperatives with pronouns.
Eg:
You believe it! (Positive Interrogative)
Don't you believe it! (Negative Interrogative)
You don't believe it!
When you join a sentence by and, or with an imperative sentence, it gives the meaning of if clause first conditional form.
Eg:
Plan a timetable and you will get success in your exam.= If you plan a timetable, you will get success in your exam.
Don't go there, or you will be in trouble. = If you go there, you will be in trouble.
Throw the waste into the dustbin or it will fly everywhere in the room. = If you don't throw the wastage into the dustbin, it will fly everywhere in the room.
When we add do to an imperative sentence it suggests an emphasis. ( Emphatic Imperative)
Eg:
Do sit down!
Do forgive me!
Do be optimistic!
The passive form of imperatives is expressed with getting + Past Participle structure.
Eg:
Get divorced when you don't like your wife's behaviour anymore.
Do as helping verb we never use with affirmative imperative. But this can be seen as a negative imperative.
Eg:
Don't be foolish!
Sometimes to make the person clear we can use a noun or pronoun in an imperative.
Eg:
John comes here.
Someone may fetch the chair.
To express anger "You" can be placed before an imperative.
Eg:
You just stop talking rubbish
Question tags in positive imperatives take will you? or can you?
Eg:
Consult a doctor, will you?
Consult a doctor, won't you? ( more emphatic)
Fetch the doctor, can you?
Fetch the doctor, can't you? ( more emphatic)
Negative imperative sentences take, will you? as its question tags.
Eg:
Don't bring that here, will you?
We place always and never before imperative sentences.
Eg:
Always work hard for your success.
Never neglect your studies.
4. EXCLAMATORY SENTENCE:
Exclamatory sentences give sudden feelings or emotions.
Eg:
What a marvellous moment!
With HOW:
Eg:
How big it is?
Icecream! How nice?
How they are working!
With WHAT:
Eg:
What a beautiful flower!
( singular countable noun)
Eg:
What beautiful flowers!
(Plural countable nouns)
Eg:
What beautiful weather!
( uncountable noun)
With SO / SUCH:
Eg:
You are so beautiful!
She is such a beautiful girl!
(Countable)
They behave such rubbish!
( Uncountable noun)
With Negative question forms:
Eg:
Isn't the girl beautiful?
Hasn't he escaped?