# "should I" or "do I need to"? which one is more appropriate?

I asked a question on this post

should I put ... at the end?

in case someone is not familiar to sequence-of-sets, this could be viewed as a punctuation at the end of a sentence (bad analogy).

following expression, which is more appropriate?

expression_1:

should I put ... at the end?

expression_2:

do I need to put ... at the end?