1 Lan goes to the supermarket on foot
2 Our garden has many flowers
3 He has black hair
4 We don't have to finish the task today (not necessary => don't have to: không cần làm gì, còn must not là không được làm gì nên câu này đề cho must là sai)
5 Are there 23 students in your class?
6 Lan is not as young as Minh
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