"Doesn't know nothing" vs. "Doesn't know anything"

[Funda]

English Grammar Tests, Elementary Level

ESL/EFL Test #76 "Anything, nothing, something, everything", question 5

My friend doesn't know ......... about her Birthday Party!

(a) something
(b) nothing
(c) anything
(d) anyone

English Grammar Tests, Elementary Level

ESL/EFL Test #76 "Anything, nothing, something, everything", answer 5

My friend doesn't know anything about her Birthday Party!

Correct answer: (c) anything

Your answer was: incorrect
My friend doesn't know nothing about her Birthday Party!
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whY anything?

Funda

[Mister Micawber]

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'Anything' is the appropriate form for a question or negative statement. You chose 'nothing' and created a double negative (doesn't know nothing), which is not permitted in standard English.
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Native English teacher at Mister Micawber's