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Choose the most appropriate verb form to fill in the blank in the following sentence:

When the Principal entered the class, a student ______ on the blackboard.

Solution

✅ Correct Option: 4

Option 1 -> Simple past tense doesn't convey an action in progress at the time of another past action.

Option 2 -> Simple present tense doesn't match with "entered" (past tense) and breaks temporal consistency.

Option 3 -> Present continuous tense is incompatible with "entered" (past tense) in the same sentence.

Option 4 -> Past continuous tense correctly indicates an ongoing action that was interrupted or happening when the Principal entered.


Hence, 4. was writing -> When describing two past actions where one was ongoing when the other occurred, we use past continuous (was/were + verb-ing) for the ongoing action and simple past for the interrupting action -> correct

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