Choose the sentence which is grammatically correct: The call is going busy, someone have be on another telephone.

گرامر کے لحاظ سے صحیح جملے کا انتخاب کریں

The call is going busy, someone have be on another telephone.

The call is busy, someone has be on another telephone.

The call is going busy, someone must on another telephone.

The call is busy, someone must be on another line.

In this sentence, "The call is busy" correctly describes the status of the line,

"Someone must be on another line" correctly uses the modal verb "must" with the base form "be" to indicate the likely reason for the busy signal.