Final answer:
Non-standard forms are grammatical structures that deviate from the standard grammar rules of a language. One example of a non-standard form in English is the double negative used in the sentence 'I never done nothing.'
Step-by-step explanation:
Non-standard forms are grammatical structures that deviate from the standard grammar rules of a language. One example of a non-standard form in English is the double negative used in the sentence 'I never done nothing.' In standard English, the correct form would be 'I have never done anything.' Here, the use of the double negative ('never' and 'nothing') creates a grammatically incorrect sentence, as the two negatives cancel each other out.