You hyphenate words to create new compound words that are uncommon.
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During the first years or decades after the creation of a word, the new word is spelled with a hyphen, which tends to disappear after a certain amount of time
for ex.: to co-operate, to cooperate.
The first phase of the process is simply the creation of a group (no one), then we get a hyphen ("no-one" as it is spelled nowadays by the British) (or "good-looking), and the last stage is the amalgamation: "always", "welcome".
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These new words are usually compound words. Hyphenating words is also not that formulaic. There are many more reasons to hyphenate words -- numbers for example "twenty-three," last names such as "Jimenez-Cabrera," you also hyphenate words that have become linked in usage such as "mother-in-law."
You do not need to hyphenate.
You do not hyphenate the number.
You would hyphenate "thank you" when it is used as an adjective before a noun, such as in "a thank-you card."
Don't hyphenate; ongoing is one word.
You hyphenate it only at the hyphen.
I think it's more accepted to hyphenate it.
Can you, or should you? You can hyphenate it if you're moving between lines in a paragraph and need to break up the word. You shouldn't hyphenate it normally.
You can hyphenate the word improvement like this: im-prove-ment.
You mean at the end of a line? Well it depends on how much room you have hyphenate at a syllable is probably best. If you have little space before the end of the line don't hyphenate a word. You could hyphenate like this trans- portation.
No...
You can hyphenate 3 bedroom when it is used in a list. It is usually not hyphenated when it is used by itself.
Yes.