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1. We have returned from the journey. We haven't returned from the journey. Have we returned from the journey?

2. I have seen my boos today. I haven't seen my boos today.  Have I seen my boos today?

3. Helen has decorated her room. Helen hasn't decorated her room. Has Helen decorated her room?

4. My cousins have been to this cinema. My cousins haven't been to this cinema. Have my cousins been to this cinema?

Объяснение: