4. My grandpa was made to start work when he was just fourteen years old. -> 5. It’s unnecessary to book a hotel; you can st

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1. 4. My grandpa had to start work when he was just fourteen years old. 

   – S + tobe made to + V-inf = S + have to + V-inf : phải làm gì

   5. You don’t have to book a hotel; you can stay in our spare room.

   – tobe unnecessary to + V-inf = S + not have to + V-inf : không cần thiết phải làm gì

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