Mai was very careful when she was young. Mai used

2 câu trả lời

=>Mai used to be careful when she was young

Used to:dùng cho thói quen ở quá khứ

Subject+used to+Verb infinitive...+Sth...(when S...)
@Mtyω

-> Mai used to be very careful when she was young.

( Used to + V0 ) chỉ một việc đã từng làm trong quá khứ

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