Complete the following sentence by using a question tag from the given options:

Students are learning swimming. __________ ?

aren't they?

The correct question tag to complete the sentence "Students are learning swimming. __________ ?" is "aren't they?".

This is because the subject of the sentence is "students," which is a third-person plural pronoun. The appropriate question tag for third-person plural subjects is "aren't they?"

The other options are incorrect because:

• "aren't he?" is incorrect because "he" is a singular pronoun, and the subject of the sentence is plural.

• "aren't we?" is incorrect because "we" is a first-person plural pronoun, and the subject of the sentence is third-person plural.

• "can't we?" is incorrect because it suggests that the speaker is asking for permission to learn swimming, which is not the intent of the sentence. The speaker is simply making a statement about the students learning swimming.