Which one of the following is grammatically correct?

the three lesson unit

the three lessons unit

Also mention whether the the correct structure is a dependent clause, independent clause or a phrase.

  • I'm not sure this is a matter of grammar. It sounds more like a question of whether your unit has 3 lessons or whether it is any number of lessons about something called "three lessons".
    – Lawrence
    Apr 4, 2018 at 15:18

1 Answer 1


In this kind of construction (I assume you're talking about a unit consisting of three lessons), the noun is in the singular, even though that may not seem logical. Also, a hyphen is typically, though not consistently, used to link the number and the noun. "The three-lesson unit", "a 40-hour work week", "a seven-day diet", etc.

  • What about an apostrophe? I mean The Three Lessons' Unit
    – M Shehzad
    Apr 6, 2018 at 7:42
  • That doesn't work. It means "the unit belonging to The Three Lessons". If an organization named "Three Lessons" donated a lot of money to a hospital, and the hospital built a new surgical unit from that money, they might call it the Three Lessons' Unit. But it doesn't mean what you were asking about. Apr 6, 2018 at 10:07

You must log in to answer this question.