#1 -- Either "on" or "at" but not "in."
#5 -- Stop the sentence after the first instance of "CD."
#3 and #4 mean that the speaker is asking someone else to play a musical instrument (a guitar, in #4, but any musical instrument in #3). #5 means the speaker is asking for music from a CD in a car or sound system in a house.
1. Shine a light on/at/in the back of the sheet.
2. Shine a light in back of the sheet.
(Which prepositions do we have to use?)
3. Play music for me.
4. I want you to play music with the guitar.
5. I want you to play the CD and make me hear the music from the CD.
(What does #3 mean, #4 or #5?)
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