Multiple choice

Which one of the sentence is different from the rest?

  1. You should plant some trees.

  2. You could plant some trees.

  3. You must plant some trees.

  4. You ought to plant some trees.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Could expresses possibility or suggestion, while should, must, and ought to all express obligation or duty of varying strength.

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