Question

You can't pass-----you work hard

Answer 1

Unless you work hard you cannot p.a.s.s the exams.

Detailed answer

Work is the most appropriate word to be used at a particular moment or sentence.

• The sentence is now a grammatically appropriate sentence that conveys a special meaning.
• The sentence now conveys that we won't p.a.s.s the exams unless we work hard.
• The word work is used to show to do something, that is to do an action.
• Any other word would have created a sentence that is either meaningless or grammatically incorrect for the situation.