[General] I hadn't expected the question and it caught me on the wrong food.

[kompstar]

'I hadn't expected the question and it caught me on the wrong food.'

I hadn't expected... <- Is it Past Perfect?

If I would say 'I didn't expect the question and it caught me on the wrong food.' ​would it be correct?

 

[emsr2d2]

"I hadn't expected" is the past perfect and it's OK in that sentence. However, please note that each time you wrote "food", it should have been "foot".

 

[kompstar]

Thanks. I know it should have been "foot" I've just made a mistake.

If I would say 'I didn't expect the question and it caught me on the wrong foot.'' Would it be also natural and correct?

 

[emsr2d2]

Yes. "I didn't" works too.

I would probably say either "... it wrong-footed me" or "... it caught me on the back foot".

 

[kompstar]

So are "This question wrong-footed me." or"This question caught me on the back foot." correct?

Do I understand right that "to catch sb on the wrong foot" means "to surprise sb" ?

 

[GoesStation]

So are "This question wrong-footed me." or"This question caught me on the back foot." correct?

Do I understand right that "to catch sb on the wrong foot" means "to surprise sb" ?

Yes. We don't use those expressions in AmE though. We'd say This question caught me off guard.