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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.
There is no need to hyphenate this expression.
Yes, you use hyphens for the phrase "top-of-the-line." It is a compound adjective that contains a preposition, so it is hyphenated.
You do not generally hyphenate the word stepchild, because it is not a hyphenated word. If the question is where to hyphenate stepchild if you have to break it across two lines, it is not difficult to determine this, because the two syllables are actually separate words: step and child. If you have to hyphenate the word to break it, you would put step- on one line and child on the next. If the word is all on one line, you do not hyphenate it.
Since the word refers to an attribute relating to the noun, it would be advisable to hyphenate Italian-sounding. Don't forget to capitalize the first word of the phrase.
If possible the general rule is to hyphenate the word where the syllables join. If a word has no syllables do not hyphenate just carry the entire word to the next line. (e.g.: Chari-table Foundation)
Instead of using the phrase "A most trusted brand", you could use the phrases :"Top of the line" orClassic
jugando con muniecas (of course the "n" has a line on top)
Always
You do not need to hyphenate.
You do not hyphenate the number.
You hyphenate it only at the hyphen.