Senses
那儿/ 那兒 there
that place; over there
那儿/ 那兒 where
where; what place; also used as a humble way to reject a compliment or to form a rhetorical question meaning "how could it be that..."
那儿/ 那兒 then
that time; used after words like 从 to mean "from then on" or "since then"
那儿/ 那兒 how
used in a rhetorical question to express negation
那儿/ 那兒 Not at all!
used as a humble polite expression to decline a compliment or express modesty
那儿/ 那兒 anywhere
used to refer to an unspecified or any place; wherever