No, "thirty first" should not have a hyphen. It is written as two separate words when used in a sentence, for example, "The event is on the thirty first of July." However, if it appears as an adjective before a noun, you can hyphenate it as "thirty-first," such as in "the thirty-first day."
No
No. It is three thirty, but in five minutes time it will be three thirty-five.
You should use a hyphen to represent years with more than two digits that end in a number other than zero, such as twenty-seven and one hundred and thirty-three. The hyphen is only used between the last two digits.
No. I cannot see any hyphen.
No, a hyphen is not needed.
Yes, there should be hyphens in "thirty-year-old" when used as a compound adjective before a noun. The correct phrasing would be "a thirty-year-old civil war." The hyphens help clarify that "thirty-year-old" is a single descriptor for the civil war.
No, there is no hyphen in "twenty-first century." When used as an adjective, it is written as "twenty-first," but when referring to the era as a noun, it is simply "twenty-first century" without a hyphen between "twenty" and "first."
without a hyphen idiot
No. Fully, when used as an adverb, is not followed by a hyphen. :)
Yes, "thirty-fifth" is hyphenated when used as a compound adjective before a noun or as a noun itself. For example, you would say "the thirty-fifth anniversary." However, when it stands alone as a noun, it can be written without the hyphen as "thirty fifth."
There should be a hyphen in twenty-three.
I believe anything-American is hyphenated and the hyphen takes the place of ' and. '