Answer:
The auxiliary verb is "IS".
Explanation:
An auxiliary verb is a helping verb that has the "to be" form in the sentence. It is used to help express the mood, voice, or the tense of the main verb, adding grammatical or functional meaning to the whole sentence.
In the given sentence, "Almost every reader is reading a newspaper daily", the verbs are "is" and "reading". While the main verb is "reading", the auxiliary verb is "is".
Thus, the auxiliary verb is "IS".
