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She didn't need to / needn't have done all that shopping; the grocery store is just around the corner.
She needn't have done all that shopping; the grocery store is just around the corner.
He must / should have done some research before visiting the city, not just wander aimlessly and miss out on all the amazing attractions.
He should have done some research before visiting the city, not just wander aimlessly and miss out on all the amazing attractions.
He could / must have visited this city before; he seems very familiar with its streets.
He must have visited this city before; he seems very familiar with its streets.
I mustn't / couldn't have done it without your help; thanks for assisting me with the directions.
I couldn't have done it without your help; thanks for assisting me with the directions.
I might / need have left my phone at the hotel; I'll call them to check if it was found.
I might have left my phone at the hotel; I'll call them to check if it was found.
He didn't need to / needn't buy a map yesterday; the city would provide free maps for tourists at the information center.
He didn't need to buy a map yesterday; the city would provide free maps for tourists at the information center.
We had to / must stand in line for an hour to get tickets for the popular attraction yesterday.
We had to stand in line for an hour to get tickets for the popular attraction yesterday.
If you want to explore the city thoroughly, you should / should've do a guided walking tour.
If you want to explore the city thoroughly, you should do a guided walking tour.
