Full-time or full time?

Is the hyphenation in this sentence correct?

  • Full-time students can't work full time and expect to get top grades.

Yes, it is.

When full-time is placed before the noun, it is a compound adjective and takes a hyphen. When placed after a verb, it becomes an adverbial phrase and no longer needs a hyphen. It's as if you wrote "Full-time students can't work all day and expect…." You wouldn't hyphenate "all day" in this case.

The same logic applies to part-time:

  • Part-time students take courses part time.
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