Double Negatives: Why I Don't Know Nothing Is Wrong

Learn double negatives in standard English: why sentences like I don't know nothing are wrong, how to correct them, and how to solve exam questions.

May 17, 2026 Updated on May 17, 2026 English Grammar , Writing Skills 7 min read

A double negative happens when two negative words are used for one negative meaning.

Non-standard: I don’t know nothing.
Standard: I don’t know anything.
Also standard: I know nothing.

The intended meaning is simple: the speaker has no knowledge. But in standard English, don’t is already negative, so the object usually becomes anything, not nothing.

Double negatives are common in songs, films, informal speech, and some dialects. That does not mean they are acceptable in standard school grammar, formal writing, or most competitive exams. In exams, sentences like I don’t know nothing, She never said nothing, and There isn’t no problem are treated as errors.

This topic connects naturally with Some vs Any because negative sentences often use any/anything/anyone/anywhere. It also helps to revise Basic Sentence Patterns in English so you can identify subjects, verbs, and objects clearly.

A negative marker is a word that makes the sentence negative. Common negative markers include:

not, n’t: do not, don’t, cannot, can’t, isn’t, wasn’t
no: no answer, no problem, no money
never
nothing, nobody, no one, nowhere
negative adverbs such as hardly, scarcely, barely

In standard English, if you want one negative meaning, you usually use one negative marker.

Rule box: Use one negative marker for one negative meaning in standard English.

Compare:

Standard: I don’t know anything.
Standard: I know nothing.
Non-standard: I don’t know nothing.

The first sentence uses don’t as the negative marker and anything as the object. The second uses nothing as the negative marker. The third uses both don’t and nothing, so it becomes a double negative.

This is the most common standard pattern.

Meaning	Standard Pattern	Example
no thing	not + anything	I don’t need anything.
no person	not + anyone/anybody	She didn’t meet anyone.
no place	not + anywhere	We couldn’t find it anywhere.
no amount	not + any	They don’t have any money.

Use any forms after a negative verb.

Correct: There isn’t any problem.
Not standard: There isn’t no problem.

You can also use no, nothing, nobody, no one, or nowhere without another negative verb.

Standard Sentence	Meaning
I know nothing.	I do not know anything.
Nobody came to the meeting.	No person came.
We found nowhere to sit.	We did not find any place.
There is no problem.	There is not any problem.

This pattern is often more direct and sometimes more formal.

Never already means not ever. Do not add nothing, nobody, or nowhere after it for a single negative meaning.

Non-standard: She never said nothing.
Standard: She never said anything.

Words like hardly, scarcely, and barely are negative in meaning. They mean almost not.

Wrong: He can’t hardly speak.
Correct: He can hardly speak.

Because hardly already carries a negative idea, adding can’t usually creates an incorrect double negative in standard grammar.

Use this method in error spotting and sentence correction.

Find all negative words: not, no, never, nothing, nobody, hardly, etc.
Ask whether the sentence needs one negative meaning or two separate negative ideas.
If it needs one negative meaning, keep only one negative marker.
Replace no/nothing/nobody/nowhere with any/anything/anyone/anywhere after a negative verb.
Read the sentence again for standard meaning and register.

I don’t know nothing.

Negative markers: don’t, nothing
Intended meaning: one negative idea
Correct options: I don’t know anything. / I know nothing.

She never said nothing.

Negative markers: never, nothing
Correct: She never said anything.

He can’t hardly speak.

Negative markers: can’t, hardly
Correct: He can hardly speak.

Non-standard: I don’t know nothing.
Standard: I don’t know anything. / I know nothing.
Non-standard: She never said nothing.
Standard: She never said anything.
Non-standard: There isn’t no problem.
Standard: There isn’t any problem. / There is no problem.
Non-standard: He can’t hardly speak.
Standard: He can hardly speak.
Non-standard: We didn’t see nobody at the gate.
Standard: We didn’t see anybody at the gate. / We saw nobody at the gate.
Non-standard: They haven’t received no reply.
Standard: They haven’t received any reply. / They have received no reply.
Non-standard: I can’t find my keys nowhere.
Standard: I can’t find my keys anywhere. / I can find my keys nowhere.
Non-standard: The teacher didn’t give no homework.
Standard: The teacher didn’t give any homework. / The teacher gave no homework.
Standard with two real negative ideas: Not all students were unhappy.
Meaning: Some students may have been happy.
Standard with contrast: I am not saying nothing; I am saying very little.
This is special, deliberate logic, not the usual exam pattern.

Examples 9 and 10 show an important point: not every sentence with two negative-looking words is automatically wrong. But most school-level double-negative errors involve one negative meaning expressed twice.

After don’t, doesn’t, didn’t, isn’t, wasn’t, can’t, and similar negatives, use anything/anyone/anywhere/any, not nothing/nobody/nowhere/no.

Wrong: I don’t want nothing.
Correct: I don’t want anything.

Never means not ever. Do not combine it with nothing for ordinary standard meaning.

Wrong: He never helps nobody.
Correct: He never helps anybody.

Students often treat hardly as a normal adverb like slowly or clearly, but hardly means almost not.

Wrong: She couldn’t hardly hear me.
Correct: She could hardly hear me.

In some dialects, double negatives are used for emphasis:

I don’t need no advice.

This is understandable in informal speech, but it is non-standard in formal English. In school grammar and competitive exams, correct it to:

I don’t need any advice.

Words like unhappy, impossible, disagree, and irregular contain negative prefixes. They do not always create the same kind of double-negative error.

Not impossible = possible, or at least possible enough.

This is a logical double negative, often used deliberately. The exam error is usually simpler: not + nothing, never + nobody, can’t + hardly.

Mistake	Correction	Why
I don’t know nothing.	I don’t know anything. / I know nothing.	Use one negative marker.
She never said nothing.	She never said anything.	Never is already negative.
There isn’t no problem.	There isn’t any problem. / There is no problem.	Do not combine isn’t and no.
He can’t hardly speak.	He can hardly speak.	Hardly means almost not.
We didn’t meet nobody.	We didn’t meet anybody. / We met nobody.	Use anybody after didn’t.
I couldn’t find it nowhere.	I couldn’t find it anywhere.	Use anywhere after couldn’t.

Which sentence is standard?
- A. I don’t know nothing.
- B. I don’t know anything.
Which sentence is standard?
- A. She never said anything.
- B. She never said nothing.
Which sentence is standard?
- A. There isn’t no problem.
- B. There isn’t any problem.
Which sentence is standard?
- A. He can hardly speak.
- B. He can’t hardly speak.

Correct the double negative.

We didn’t see nobody near the office.
I can’t find my wallet nowhere.
The team hasn’t made no progress.

Rewrite using nothing: I don’t remember anything.
Rewrite using any: There is no reason to worry.
Fill in the blank: She didn’t tell me ______ about the meeting. (anything/nothing)

B — after don’t, use anything.
A — never is already negative.
B — isn’t takes any, not no.
A — hardly already means almost not.
We didn’t see anybody near the office. / We saw nobody near the office.
I can’t find my wallet anywhere.
The team hasn’t made any progress. / The team has made no progress.
I remember nothing.
There isn’t any reason to worry.
anything — after didn’t, use anything.

Double negatives are usually incorrect in standard English when they express only one negative meaning.

Final rule: For one negative idea, use one negative marker: not + any, or no/nothing/nobody without not.

Memory trick: One negative job, one negative word.

Revise these correct pairs:

I don’t know anything. / I know nothing.
She never said anything.
He can hardly speak.

Informal speech may use double negatives for emphasis, but standard grammar and exams expect the one-negative rule.

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