It's optional
No, "full length" is written without a hyphen.
No, the word "part time" does not require a hyphen when used as an adjective. It is commonly written as two separate words in English language.
You say "A hyphen" because the sound of the letter "H" at the beginning of the word "hyphen" is pronounced, making it a consonant sound.
No, decision making does not have a hyphen. It is considered a compound noun that is used without a hyphen.
If you mean the word for 19, then there is no hyphen and it is nineteen, not nine-teen.
The correct spelling is "full-time" with a hyphen when used as an adjective, such as in "full-time job." When used as a noun or adverb, it can be written as "full time" without a hyphen.
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.
No, "full length" is written without a hyphen.
No, the word "part time" does not require a hyphen when used as an adjective. It is commonly written as two separate words in English language.
Yes. Part-time, full-time, mother-in-law, etc.
It is one word, lunchtime (midday mealtime).
No there's not a hyphen.
hyphen
does time-line have a hyphen
Yes, there is. Often, after a hyphenated word has been used for a very long time and is used by many people, the hyphen will be eliminated. Email is an example of this. Originally the word was e-mail.
You say "A hyphen" because the sound of the letter "H" at the beginning of the word "hyphen" is pronounced, making it a consonant sound.
The dictionaries that list it use a hyphen.