Which of the following sentences is correctly formed?

The correct answer is Option (4) → While Papa was parking the car outside the mall, the rain began to pour.

A sentence needs a main part:

• A part that starts with “while”, “because” or “although” cannot stand alone. It needs a main part with its own subject and full verb.
• Here the main part is the rain began to pour. It has the subject “the rain” and the verb “began”.

Why the Other Options are Incorrect?

Option 1: While Papa was parking the car outside the mall, the rain beginning to pour. — Incorrect. The option says “the rain beginning to pour”. “Beginning” is only an -ing form, not a full verb, so the sentence has no main part.

Option 2: While Papa was parking the car outside the mall. — Incorrect. The option has only the “while” part. It does not say what happened, so it is not a full sentence.

Option 3: While Papa was parking the car outside the mall, and the rain began to pour. — Incorrect. The option says “and the rain began”. “While” already joins the two parts, so the extra “and” is wrong.