Part 2:
“You only die once.” While “only” could be modifying “you,” your intuition should tell you this is unlikely. In modifying “die,” the meaning becomes: you do everything except die more than once.
“You die only once.” Meaning, you die one time only.
Part 3:
Notes: placement of “only” is very important. If you place it in the wrong place, it will either change the meaning of the sentence or make it incomprehensible.
I once got some promotional material from Comcast. One of the sentences had a free floating “only” it. I couldn’t make heads or tails of what the sentence meant. When I called them up, it took a while for them to figure it out themselves.
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