how do I do the preposition phrases and object?

Prepositional phrases begin with a preposition and end with a noun or pronoun.

Examples:

from the family
to our house
in the refrigerator
under the old lilac bush
with me
of the girls

For more information check these sites.

http://www.chompchomp.com/terms/prepositionalphrase.htm

http://www.englishclub.com/grammar/prepositions-list.htm