I know that "You decided" is simple past, but I've never ever seen this kind of construction until I listened it in a song (You did decide):
Pronoun + Simple Past(Past assistant did) + simple present
Then, what is the difference? Does this construction really exit?
Answer
In simple sentences, we don't usually use the verb to do to indicate the tense(past/present). It only occurs in a question(interrogative)
did you decide it? -past
do you decide it? -present
However, you can use it in simple sentence for emphasis
You decided it. - simple past tense
You did decide it. -simple past tense but more emphatic.
EDIT: It also occurs in negative sentences
I don't decide it
I didn't decide it
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