/t/ as in the English word [tɹi] is a/an

Make sure u look up a great scource

•as parts of ceremonies and often to ask for peace and blessings from evil. • late at night to entertain themselves or foreign visitors at the camp. • on long journeys through the arizona desert, to keep their energy and minds boosted. • during the long winter nights, when they were cold and the land was not suitable for farming.

Supporting details in expository texts serve a different purpose than supporting details in narrative text.
c.