had to, didn´t have to, could, couldn´t

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He was rich. He ... work in his childhood.

He was rich. He didn´t have to work in his childhood.

My parents didn´t like my hobby. I .... buy the equipment myself.

My parents didn´t like my hobby. I had to buy the equipment myself.

I... use my mobile, because I had my own laptop.

I didn´ t have to use my mobile, because I had my own laptop.

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