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Is anybody can help? Thank you very much in advance ..

Could you tell me where the toilet is?

Could you tell me where is the toilet?

Do you know where the toilet is?

Do you know where is the toilet?

Which sentences is correct?
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Hi,

Could you tell me where the toilet is? OK

Do you know where the toilet is? OK

Do you know where is the toilet? No

Clive
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khoffI would add that in the U.S. (not sure about Britain)
My British supervisor didn't use the word "toilet" as well.
She used to ask "Where's the loo?" or "Where's the ladies?" (without "room"), and used to refer to men's room as "gents'", so if she had been a man I guess she'd have asked "Where's the gents?"

She is a Londoner in her fifties (I think both gender and age are relevant, here! Emotion: wink).
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Comments  
I would add that in the U.S. (not sure about Britain) we would usually say "Where is the restroom/Men's room/Ladies' room?" (in a store or restaurant) or "Where is the the bathroom?" (in someone's home).
 Tanit's reply was promoted to an answer.
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Thank you to all the reply:)