台Taivo A Taiwan Mandarin dictionary

呢

˙ㄋㄜ

1(sentence-final particle) used in questions to link back to prior discourse or context ("what about...?", "and...?")
2(sentence-final particle) indicating that a state or situation still holds
3(discourse particle) used to mark a slight pause or emphasis in speech

Example

你爸呢？

nǐ bà ne

How about your father?

Keep 呢 and it comes back until you know it.