Choose the correct passive form of the given sentence:The students pa…

The correct answer is Option (3) → The old school bus was painted bright yellow by the students for the annual day.

Passive of “paint something + a colour” (simple past):

Change	Active	Passive	Why
Object becomes subject	the old school bus	The old school bus	The bus receives the action, so it becomes the subject.
Tense kept	painted	was painted	“Painted” is in the simple past, so the passive stays in the simple past: was / were + past participle (V3). “Was” because the bus is one.
Colour kept after the verb	bright yellow	bright yellow (right after “was painted”)	“Bright yellow” tells what colour the bus became. It stays right after the verb, before the “by” phrase.
Agent (by ...)	The students	by the students	The students are named, so the doer comes after “by”.
Full sentence	The students painted the old school bus bright yellow for the annual day.	The old school bus was painted bright yellow by the students for the annual day.

Other verbs that take an object and a word telling what it becomes work the same way, like elect, call and keep. Example: The children called the new puppy Bholu. → The new puppy was called Bholu by the children.

Why the Other Options are Incorrect?

Option 1: Bright yellow was painted the old school bus by the students for the annual day. — Incorrect. The colour “bright yellow” is made the subject. The bus is what receives the action, so the bus must be the subject.

Option 2: The old school bus has been painted bright yellow by the students for the annual day. — Incorrect. “Has been painted” is the present perfect. The active “painted” is the simple past.

Option 4: The old school bus is painted bright yellow by the students for the annual day. — Incorrect. “Is painted” is the simple present. The active “painted” is the simple past, so it needs “was painted”.