Question

rahul has drunk a gllasz of water (change intragative sentence)

Answer 1

Pikachu! Your answer ^^
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In an interrogative sentence, a question is asked

so your answer will go like this ^^ 

Has Rahul drunk a glass of water? 

Here has is a helping verb but it is used like a question word and subject is placed after it
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Pikachu! ^^

Answer 2

Has Rahul drunk a glass of water?  

Explanation:

• The sentences that need a response when used are known as interrogative sentences.

• In simpler words, the questions we ask in daily life are called interrogative sentences.

• These types of sentences always have a question mark in the end and start with who, what, where, why, how, which, etc.

• The composition of a simple interrogative sentence is:

• auxiliary verb + subject + verb.