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Two flatmates are dividing up household duties. Complete their conversation by selecting the correct option for each blank.
Alex: "We _________________________ pay the electricity bill by Friday, or they'll cut our power!"
Sam: "Got it. What about the dishes?"
Alex: "Well, you _________________________ wash them tonight — I already did them. But you _________________________ take out the rubbish because it's starting to smell."
The correct answers are must, don't have to, and need to.
Must expresses strong necessity — there's a deadline and a serious consequence. Don't have to means it's not necessary because the task is already done. Need to shows that taking out the rubbish is necessary due to the situation (the smell!).