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Underlined verb is are
yup he is correct
The rules say I can't give you the answer, but I can help. There are many verb lists online, but I remember Are is a linking verb
ok so do you know why b?
But are is also a helping verb
So I would say A, because a linking verb is "to be" and are is "to be doing"
Helping verbs are verbs that, as their name suggests, help the main verb in a sentence by extending the meaning of the verb. They add detail to how time is conveyed in a sentence. As a result, helping verbs are used to create the most complicated verb tenses in English: the progressive and the perfect aspects.
are is extending they
I was thinking are was lining They with Preparing
are is helping they to extend the sentence into preparing