Q:

“What’s that noise ? It sound like an aeroplane,” said Ravi.

• 1
  Ravi asked what the noise was, adding that it sounded like an aeroplane.
• 2
  Ravi demanded to know what the noise was, saying that it sounded like an aeroplane.
• 3
  Ravi asked what the noise could have been saying that it sounded like an aeroplane.
• 4
  Ravi wondered about the noise thinking that it sounded like an aeroplane.