Yes, the possessive form of the noun week is the correct form for 'the end of the week' (the week's end).
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Neither is correct. We say "at the end of August."
No--at is a preposition, and you technically shouldn't end a sentence with a preposition. In this example, it is sufficient to say "Where do you live?"
If what you're trying to say is a question- 'Has the bell gone?', then yes, that's correct. (Make sure you put a question mark at the end)
Can you end my day with correct grammar
The correct form is "wit's end", the noun "wit" is singular, possessive. The end of your "wit".