"I found all of the interesting things the sea has washed up" What is the part of speech for "has"

Answer 1

In this statement, “has” is an auxiliary verb combining with the past participle (“washed up”) to form the perfect tense.

The perfect tense is used to indicate that an action (“washed up”) has been completed in relation to another time or action. In this case, the time or action is the present, the now; we know this because the word “has” is in present tense.

Mastering the perfect tenses is one of the most difficult parts of understanding the subtleties of our language.

Answer 2

The sea

Answer 3

helping verb is that what you meant