Please can somebody tell me which is correct...thankyou or thank you? Does it depend on the sentence they are being used in?

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thank you is correct.
thankyou is a word that doesn't exsist.
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thankyou adjective expressing gratitude

thankyou noun anything expressing gratitude (esp a gift)
Anonymousthankyou adjective expressing gratitude
thankyou noun anything expressing gratitude (esp a gift)

Sorry, but no. These are written as two words.

If you want to use them as adjectives or nouns, use a hyphen.

Did you write your thank-you notes?

Make sure you say your thank-yous to your host and hostess before you leave. (This is rather colloquial.)

Whether 'thank-you" or "thankyou" is the correct spelling for the noun is a matter of opinion and language development. See this discussion for an explanation of correct usage:
http://www.future-perfect.co.uk/grammartips/grammar-tip-thank-you-thankyou.asp
You have to know when your are using a verb and when you are using a noun, something beyond the ken of most English-speaking people under 45 because for some strange reason teaching grammar in schools went out of fashion.
There is a process of development in the English language whereby new nouns derived from verbs first appear in a hyphenated form such as the archaic "to-day" of a century or two ago, and then gradually take the closed form such as "today" which is now current throughout the English-speaking world.
It may be that this process takes longer in some countries than others, and that the noun "thankyou", correct in Australia and the UK at least, is still spelt as "thank-you" in some more distant jurisdictions.
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Doesn't exist? Who says so? Thankyou has always been the correct form of thanking somebody, (in Britain) unless you are saying 'I wish to to thank you', which is obviously two words.
AnonymousThankyou has always been the correct form of thanking somebody, (in Britain)
It has never been correct. as a way of thanking somebody.

Some dictionaries give the single word as a noun, but most hyphenate the two words.
That's not true.
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