Yes, back-to-school is hyphenated when used as an adjective phrase before a noun, such as "back-to-school shopping."
Yes, "school-age" is typically hyphenated when used as an adjective before a noun (e.g., school-age children).
"Mid back" is typically hyphenated when used as an adjective to describe the area between the upper and lower back.
Yes, "pre-school" is a hyphenated word.
No, "self-interest" is typically not hyphenated.
Yes, "self-diagnose" is hyphenated.
Yes, it should always be hyphenated.
Yes, "school-age" is typically hyphenated when used as an adjective before a noun (e.g., school-age children).
"Mid back" is typically hyphenated when used as an adjective to describe the area between the upper and lower back.
If you're using "after-school" as an adjective (e.g. I participate in an after-school program -- after-school is describing the kind of program I participate in), then it is hyphenated.If you're using "after school" as an adverb-noun phrase (e.g. Meet me after school -- after school tells when to meet me), then it is not hyphenated.
Yes, "pre-school" is a hyphenated word.
no it is not hyphenated. It isn't because you have added a prefix ( a bit that changes the meaning and goes at the front, if it is at the back, it is a suffix.)
The hyphenated non-school would be correct, but would be an unusual usage.
It is not hyphenated.
The term for an educator can be one word, "schoolteacher."It also appears less frequently as a hyphenated form school-teacher.
Motorcycle is not hyphenated
No it's not hyphenated.
As a statement of a time, it is two words, as in "Come see me after school."As an adjective, it can be one word, as in afterschool practice, or afterschool meetings.