Sentence b is correct. In a negative question, not should be positioned after the subject (my request). Sentence a is grammatically possible if you make the contraction: Why hasn't my request been fulfilled?. Have a look at this page from the Cambridge Dictionary (see the 'Not and n’t in questions' section) for more explanation and examples
Read the following sentences and change them into the negative. 1. The girl sells flowers. 2. He works in a factory. 3. The boy adores his pet dog. 4. In a sentence, the verb which is used along with the main verb or the principal verb that denotes the action done by the subject is called a helping verb. As the name suggests, a helping verb is a verb that helps another verb and is employed in a sentence to modify the tense , voice or mood of the sentence. Related: 11 Rules to transform Affirmative Sentences into Negative Sentences. Rules to Transform Assertive Sentences into Interrogative Sentences – Yes-No Questions: Rule 1: Using Do-verb: If an assertive sentence has an action verb, a do-verb is used in the interrogative sentence and use a negative word with the do verb. E.g. –

Re: use "some" in affirmative sentence and "any" in negative, interrogative sentence Michael Swan (Practical English Usage, 2005.539-40) writes, "Both some and any can refer to an indefinite quantity or number.[] Some is most common in affirmative clauses. Any (used in this sense) is a 'non-affirmative' word, and is common in questions and

Rules: In this rule, affirmative sentences can be transformed into negative sentences by putting a negative prefix or a word having the opposite meaning (Antonym) after a negative word like “no”, “never”, etc. Examples: 1. Affirmative: He is a bad boy. 1. Negative: He is not a good boy. 2. Affirmative: He is sometimes lazy. 2.
Negative Interrogative Sentence? Forums Grammar & Sentence Structure 1 2,137 + 0. Why won't you meet her? Why will you not meet her? Which is the correct word order ?
An interrogative sentence is used to pose a question and it can be divided into several types according to its question form. Generally speaking, such a question implies the speaker’s confidence about what is asked. Sometimes, the confidence is not so strong. There is one point for attention: the affirmative responses depend on the agreement
Negative: The concert wasn’t terrible. Negative: He isn’t staying home tonight. Negative: The weather isn’t suitable for a picnic. Negative: She doesn’t lack experience in her field. Negative: The hotel room doesn’t have an obstructed view of the ocean. Negative: He doesn’t dislike playing basketball. .
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    • what is negative interrogative sentence