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Forming affirmative, interrogative and negative sentences.
English clauses can be organized as affirmative statements, questions, or negative sentences according to their communicative function and grammatical structure.
The same basic proposition can often be expressed as a statement, question, or negative statement by changing auxiliaries, word order, or negative marking.
Affirmative statements present information without grammatical negation.
For example, She works here, They have finished, and He can swim.
Negative statements normally use not with an auxiliary or modal verb.
For example, She is not ready, They have not finished, and He cannot swim.
When there is no other auxiliary, English uses do, does, or did to form ordinary negative clauses.
For example, I do not know, She does not work here, and They did not leave.
When there is no other auxiliary, English uses do, does, or did to form ordinary questions.
For example, Do you know? Does she work here? and Did they leave?
Be forms questions by inversion with the subject and does not require do-support.
For example, Are you ready? Was she late? and Have they been here? Here have is auxiliary, while be is part of the progressive in the last example.
Modal verbs form questions by moving the modal before the subject.
For example, Can you help? Should we leave? and Would they agree?
Yes/no questions ask whether a proposition is true and commonly use auxiliary-subject inversion.
For example, Are you ready? Have they arrived? and Do you understand?
Wh-questions begin with question words such as who, what, where, when, why, or how and normally use question word order.
For example, Where do you live? and Why did she leave?
When the question word itself is the subject, auxiliary inversion normally does not occur.
For example, Who called you? and What happened?
When the question word is the object, normal auxiliary inversion generally occurs.
For example, Who did you call? and What did she buy?
Negative questions combine question structure with grammatical negation and can express expectation, surprise, confirmation, or disagreement.
For example, Aren’t you coming? Didn’t she call? and Why haven’t they arrived?
Be takes not directly in negative clauses and negative questions.
For example, She is not ready and Isn’t she ready?
Modal verbs take not directly to form negative clauses.
For example, You cannot stay, He should not worry, and They might not come.
The auxiliary have takes not directly in perfect constructions.
For example, She has not finished and They had not arrived.
The auxiliary be takes not directly in progressive constructions.
For example, She is not working and They were not waiting.
When a clause contains several auxiliaries, not normally follows the first auxiliary.
For example, She has not been working and They will not have finished by then.
In questions with several auxiliaries, the first auxiliary normally moves before the subject.
For example, Has she been working? Will they have finished by then?
English commonly uses short answers with an auxiliary or modal rather than repeating the entire clause.
For example, Are you ready? Yes, I am. Did she leave? No, she didn’t.
Negative short answers normally contain the appropriate auxiliary or modal plus not.
For example, No, I am not. No, she doesn’t. No, they haven’t.
Do, does, or did can be used in affirmative statements for emphasis or contrast.
For example, I do understand and She did call me.
Emphatic do can be used to contradict an assumption or negative claim.
For example, I do want to help means that the speaker strongly confirms the proposition.
In many questions, especially conversational ones, a preposition can appear at the end of the question.
For example, Who are you talking to? and What are you looking at?
In formal English, a preposition can precede the question word.
For example, To whom are you speaking? and For what purpose was the document created?
Indirect questions normally use statement word order inside the embedded question.
For example, Do you know where she lives? not Do you know where does she live?
Some words such as hardly, rarely, scarcely, and seldom have negative meaning even though the verb is formally affirmative.
For example, She hardly ever complains means that she almost never complains.
Standard English generally avoids multiple negative elements when they are intended to express a single negative meaning, except in varieties where negative concord is grammatical.
In standard formal English, use I do not know anything rather than I do not know nothing.
Negative or restrictive expressions at the beginning of a sentence can trigger inversion in formal or emphatic constructions.
For example, Never have I seen such a thing. This is an advanced connection to emphasis and inversion.
Use the correct auxiliary, word order, and negative marker according to the tense and sentence type.
Common mistakes include omitting do-support, using do with be or modal verbs, retaining statement word order in direct questions, using incorrect short answers, and creating unintended double negatives.