Yes, "sweet-smelling" should be hyphenated when used as a compound adjective before a noun, such as in "a sweet-smelling flower." The hyphen helps clarify that the two words work together to describe the noun. However, if it appears after the noun, as in "the flower is sweet smelling," the hyphen is not necessary.
No it doesn't need to be hyphenated.
No it doesn't need to be hyphenated.
The noun phrase 'four week vacation' does not need to be hyphenated.
No, "reassigned" does not need to be hyphenated. The prefix "re-" is commonly used with verbs and is typically not hyphenated unless it precedes a proper noun or creates confusion. Therefore, "reassigned" is correctly written as one word.
yes for clarification
The term "buy-in" is typically hyphenated when used as a noun to refer to an agreement or acceptance of a proposal. For example, you might say, "We need to get buy-in from the team." However, when used as a verb, it is not hyphenated, as in "We need to buy in to the new strategy."
No it doesn't.
No it doesn't need to be hyphenated.
does write up need a hyphen
No the word "midday" is not hyphenated.
Yes it should be hyphenated.
Yes it should be hyphenated.