What is the prepositional phrase in the sentence? Put the lasagna in the oven tonight if you don't mind.
1) put the lasagna
2) in the over
3) the oven tonight
4) if you don't mind
I think #1
No.
Check this list of prepositions.
http://s-media-cache-ak0.pinimg.com/originals/7a/6a/19/7a6a199d93dd6ca88eeae6c761586b59.jpg
Remember that a prepositional phrase begins with a preposition and ends with a noun or pronoun that is its object.
Examples:
by the road
under the bed
of my family
in the living room
on the table