Choose the correct question tag to complete the sentence:
You must take this medicine after dinner, ________?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → mustn’t you
Question tag after “must”:
Here “must” tells what you have to do. It is the helping verb, so the tag repeats “must”. The sentence is positive, so the tag is negative: “mustn’t you”.
Complete sentence: You must take this medicine after dinner, mustn’t you?
Why the Other Options are Incorrect?
Option 1: don’t you — Incorrect. “Don’t” is used only when the sentence has no helping verb. Example: You take the metro to college, don’t you?
Option 2: must you — Incorrect. This is a positive tag. It goes with a negative sentence. Example: You mustn’t shout in the library, must you?
Option 3: shouldn’t you — Incorrect. The tag repeats the same helping verb. “Shouldn’t” goes with “should”. Example: You should rest your back, shouldn’t you?