Identify the grammatically correct form of the given sentence.
Sentence: Hardly had I clean the floor when all the children had arrived in the hall.
I. Hardly had I cleaned the floor when all the children arrived in the hall.
II. Hardly had I clean the floor than all the children arrived in the hall.
III. Hardly had I clean the floor when all the children arriving in the hall.

Correct option is D

Option (d) is the correct choice.
Explanation of error:
· "Hardly had" is always followed by past participle (V3 form).
· Therefore, "clean" should be "cleaned."
· Also, "Hardly had ... when" is the correct pair (NOT "than").
· "Arriving" is wrong; it should be "arrived."
Grammatical rule used:
· Hardly/Scarcely are negative adverbs used with past perfect tense + when for the second event.
Correct Sentence:
· Hardly had I cleaned the floor when all the children arrived in the hall.
Example:
· Hardly had he finished speaking when the audience started clapping.
�� Information Booster:
· Remember:
· Hardly/Scarcely → when
· No sooner → than