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Choose the correct form of the verb "to swim" in the present continuous tense for the following sentence.
The children _________________________ swimming in the pool.
The present continuous tense is formed using the auxiliary verb "am," "is," or "are" followed by the present participle (-ing form) of the main verb. In this case, the subject is "the children," which requires "are" as the auxiliary verb, and the present participle of "to swim" is "swimming." So, the correct answer is "are swimming."