Negation

The sentennece: I didn't slept is incorrect,

The negation works as follow:

1. VERB:
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1.1. With a simple form:
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Subject + (The negative of the auxiliary 
DO (or MODALS)) + simple form.
Examples:
- I don't  know
- We didn't see (Not I didn't saw)
- He couldn't stay

1.2. With a past participle:
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Subject + (The negative of the  auxiliaries 
BE or HAVE) + past participle.
Examples:
- They haven't  seen 
- She wasn't driving 
- You hadn't forgotten

2. NOUN:
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Do not use a negation two times in the
same sentence. 

The sentence like : I do not see no evidence,
is incorrect.

2.1.Positive sentences:No+noun
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Examples:
I see no evidence
No one is concerned

2.2.Negative sentences: noun
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Examples:
I do not see any evidence
They are not concerned 

3. Remark:
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Use NOT with verbs and NO with nouns.

None of them had been present.Their names were not
written on the list. Nobody expected to see them.
They have not been aware of the speech and
there was no way to know about this talk.