(+) Those are my friends.
(-) Those are not my friends.
(?) Are those my friends?
\(\Rightarrow\text{ }Answer\text{ : }\)
\(\left(+\right)\text{ }Those\text{ }are\: my\text{ }friends.\)
\(\left(-\right)Those\text{ }are\:not\text{ }my\text{ }friends.\)
\(\left(?\right)Are\text{ }those\text{ }my\text{ }friends\text{ }?\)