Which is the subject?

[Jaguar]

Hello,

I'm really stuck on this one. My mind has gone blank. Need some help please.

Where is the subject in this phrase? I'm quite sure it's 'I'.

--I'm worried about something--

Taking into account that we don't use do/does/did if who/what etc. is the subject, the question should be:

What did are you worried about?

But it isn't, it's: What are you worried about?

Why is this?

Thank you

Jag

[jlinger]

The subject is I. I - am - worried.
Change it to You and it's You - are - worried.

So the question is Why - are - you - worried?

It has nothing to do with do/does/did/done.

[Jaguar]

OK. Thank you

It's from an exercise that I'm looking at.
It looks like the last question is to catch you out.

I feel daft now

Jag