Is this informal speech if I say ‘where’s my clothes’ instead of ‘where are my clothes’?
Is this use only with ‘where’ or can it be used in all questions with plural nouns?
You will often here ‘there’s lots of people’ as opposed to ‘there are a lot of people’. Let’s see what our native speakers have to say on the topic…[YSaerTTEW443543]
TOEIC listening, photographs: Among the dunes[YSaerTTEW443543]
Yikes, not sure I want to comment on this … is Beeesneees around? 
Personally, I use this form all the time when speaking, but I would not use it in written language.
I must say that I really only use it or hear it with where or there as Torsten said.
Here in the U.S. in spoken English, the question is almost always “slurred into” the following verb:
Who’re those people.
What’re they doing?
Where’re they going?
How’re they getting there?
When’re they coming back?
Of course, these are not actual contractions, just how the spoken words sound.
Also, in the above example, “Where’s they going?” would sound very odd. “Where’s” is usually only substituted for “Where are” when asking where a particular set of objects is.
Where’re my clothes? That’s the question in morning:) Sometimes
I’m having a relaxing weekend in a country hotel… can’t keep away from the Internet though.
I agree with your comments.
[YSaerTTEW443543]
TOEIC listening, photographs: A firemen[YSaerTTEW443543]