Winston Churchill, who was famous for his motivating speeches during World War II, is said to have been chided for ending a sentence with a preposition. He supposedly responded with: “This is the kind of meaningless pedantry up with which I will not put.”
You may have heard English teachers say that a preposition should never end a sentence. If so, you can scratch that rule as invalid. We need these “prepositional verbs” at times, to express conditions that can be stated in no better way.
For example, when the room is dark, we need to “turn on” the light. The preposition is a part of the action of the verb and does not begin a prepositional phrase. In dialogue, Mom might say to Johnny, “Would you turn the light on?” This structure is better than writing: “Turn on the light,” because “on” can be misconstrued as the beginning of the prepositional phrase: “on the light.” Obviously, Johnny isn’t being instructed to place himself on the light and turn, which is technically what turning “on the light” might mean.
For more about prepositional verbs, Click Here.
It is easy to forget some of these rules, and as you just noted, it’s a good plan to change some.