哪[nǎ]

代

1. (used in questions) which; what

♦ 我们这里有两位姓张的, 您要找的是~一位？ We've got two Zhangs here. Which one do you want to see?

♦ 你学的是~国语言？ What foreign language are you studying?

2. (used in statements to indicate sth. indefinite) whichever; any that

♦ ~天有空就请过来。 Come over any time you are free.

♦ 你最喜欢~件就拿~件。 Take whichever you like best.

副(used in rhetorical questions to express negation)

♦ ~有这样的事？ Nothing of the sort (or kind)!

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哪[na]
助(used in the same way as 啊, only after words ending with consonant n)

♦ 谢谢您~! Thank you!

♦ 我没留神~! I wasn't noticing.

♦ 加油干~! Speed up! or Come on!