Yes. Part-time, full-time, mother-in-law, etc.
No
'Part-time' (with a hyphen) is the correct spelling.
Not always, it can also be spelled part time as just two words.Part-time and part time are the two main, correct spellings.
does time-line have a hyphen
The word "hyphen" is a noun. It refers to a punctuation mark (-) used to join words or parts of words together.
Yes. Full-time is the 'opposite' of "part-time". As two words it tends to refer to the end of the playing period of a football game - full time as opposed to half time.
Time frame should always be two words without a hyphen.
It's optional
an hyphen
The "-" can be a mathematical "minus" sign or a "hyphen" if used as part of text.
No, it does not have a hyphen.
No, a capital letter is not used after a hyphen unless it falls at the beginning of a sentence or is part of a proper noun. The word after the hyphen should be lowercase unless it is a proper noun.