It's unneccesary, but you can say 7-year-old boy to make it one word. Just hyphenate any place where you would normally see a space.
Yes, you use hyphens for the phrase "top-of-the-line." It is a compound adjective that contains a preposition, so it is hyphenated.
The gold ingot was too heavy for the ten year old boy to carry.
No. Use hyphens when creating a compound adjective, for example a two-foot width or a four-foot depth.
No. The phrase is spelled "by the way" (an aside). You would only use the hyphens if the phrase "by the way" was being used as an adjective, as is seen in the term "out-of-the-way location."
I am amazed that the 8 year old child was able to perform that musical composition!
no hyphens - 57 years old is what you are.
A 13-year-old boy absolutely CAN impregnate a girl. Use condoms!
You use hyphens to make compound words that are not recognizable in common usage.
Do I address a 5 year old boy as Master when sending him a card.
If you're using the phrase as an adjective (example "This easy-to-use remote is great!") then it will definitely need the hyphens. Otherwise, the hyphens are incorrect.
This depends on how you use the expression in a sentence.If it functions like an adjective, use the hyphens. For example:I'm going to have a few out-of-town guests next weekend.If it functions like an adverb, don't use hyphens. For example:I'll be out of town next weekend.
Normally, an 11 year old boy is not supposed to have facial hair quite yet. If you do, I would just use mens' facial hair products.
no because an 11 year old boy/girl arm pits are not fully developed.
Yes, you use hyphens for the phrase "top-of-the-line." It is a compound adjective that contains a preposition, so it is hyphenated.
If you are a 12 year old [cis] boy then you do not have a vagina to insert a tampon, nor do you have a uterus to menstruate, thus you cannot try tampons.
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No, "out of control" does not use hyphens. It is a phrase that stands alone without the need for hyphenation. Hyphens are typically used to connect words that function together as a single idea when they appear before a noun, such as "out-of-control behavior."