SHOULD THERE BE A QUESTION MARK OR NOT? IT'S AN INDIRECT QUESTION BUT AN ANSWER WOULD BE EXPECTED.
There's a party later if you're interested.
There's a party later if you're interested?
SHOULD THERE BE A QUESTION MARK OR NOT? IT'S AN INDIRECT QUESTION BUT AN ANSWER WOULD BE EXPECTED.
There's a party later if you're interested.
There's a party later if you're interested?
No, because it is a declarative statement.
There should be a comma though.
There's a party later, if you're interested.
**on either side of the words you want to emphasise. :-) – Chappo Hasn't Forgotten May 07 '19 at 12:22