How to say "I don't know what you're referring to"?


Someone asked me something without including the subject. I don't know what
they were referring to, so how would you go about asking for the subject of
what they are talking about, or just generally asking what they are talking
about?




Japanese's particle system comes in handy here.

`何【なに】が（ですか）？` (for asking the subject)

`何【なに】を（ですか）？` (for asking the object)

Exchanges like this can be difficult to translate into English...

Or for instance:

`（「あれ」って）何【なん】のこと？（ですか？・かよく分かりません）`

