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Is the verb 'is' in this example an auxiliary verb?

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up vote 7 down vote accepted

Yes, as described in Wikipedia

The auxiliary verb be is used with a present participle to form the progressive aspect; for example, "I am riding my bicycle"

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An auxiliary verb is a verb used in forming the tenses, moods, and voices of other verbs.
In English, such verbs are be, do, and have.

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Yes 'is' is an auxiliary verb to show the present continuous form of tense in the sentence you have quoted.

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