Articles

Deepak writes "He studies in an university", thinking "u" is a vowel letter so it needs "an". His sister says the sound matters, not the letter. Who is right?

Sanvi writes "Give me an information about the trip", thinking "information" starts with a vowel sound, so "an" is fine. Her friend says the problem lies elsewhere. Who is right?

Rohit writes "I saw a dog. A dog was barking loudly", using "a" again in the second sentence, thinking one article works throughout the same story. His teacher says the second mention needs a different word. Who is right?

Meera wants to make a general statement that dogs (as a whole) are loyal animals, and writes "The dogs are loyal animals". Her brother says this changes the meaning. Who is right?