"Has anyone seen my blue sweater with the white snowflake designs?" What is the verb tense of this sentence?
The easiest way to identify verb tenses in a sentence is to rewrite the sentence as a statement. In your question, we could reword the sentence as "Anyone has seen my blue sweater with the white snowflake designs." Now, our verb is all together after the subject, "anyone". Our verb in the sentence is "has seen".
Perfect tenses occur when the writer writes with a helping verb followed by a past tense verb. Perfect tenses can appear in three ways:
Past Perfect, in which the verb is followed by "had", for example, She had run down the stairs.
Present Perfect, in which the verb is followed by "has", for example, Jenny has played piano for ages.
Future Perfect, in which the verb is followed by "will have", for example, She will have left when you get there.
In your sentence, "has seen" is the verb. If we look at the list above, verbs that follow "has" are considered present perfect. If you need more information on the types of perfect tenses, consider using www.cws.illinois.edu/workshop/writers/perfectforms/