Choose the sentence in which the modal has been used incorrectly:

The correct answer is Option (1) → Grandpa can fixes any old radio in the house.

A modal is followed by the base verb:

• The given sentence says “can fixes”.
• After a modal like can, we use the base verb (the simple form of the verb, like go, eat). The verb never takes -s after a modal.
• Here “fixes” has an -s, so the sentence is wrong.
• Corrected: Grandpa can fix any old radio in the house.

Why the Other Options are Incorrect?

Option 2: Need the children wear their uniforms to the annual day rehearsal? This sentence is correct. In a question, “need” can work as a modal. It comes before the subject and takes the base verb “wear”.

Option 3: Grandma said that she might visit us during Pongal. This sentence is correct. After the past verb “said”, “may” changes to “might” in reported speech.

Option 4: If the ferry had left on time, we would have reached Alibaug by noon. This sentence is correct. It talks about a past that did not happen, so “had left” is followed by would have + past participle (V3).