I climbed up the tree.

[Unregistered]

Dear Teacher,
In a sentence of "I climbed up the tree," does the "up" function as a "preposition" or "adverb"?

I'd be very appreciative of your assistance.

Thank you iin advance.

Soo

 

[oregeezer]

Preposition - "up the tree" is a prepositional phrase answering the question 'Where did you climb?'