1. If he does not stand first in his class, his father won't be pleased.
2. Unless he stands first in his class, his father won't be pleased.
Do the sentences have the same meaning?
Yes. I don't hear ' stand ' very often in this context. I usually hear eg If he is not first in his class , .
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Yes.
I don't hear 'stand' very often in this context.
I usually hear eg If he is not first in his class , . . .