Question

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My friend is doing his lessons now. (общий, альтернативный, Who?)
I saw my friend in the street yesterday. (общий, альтернативный, Where?)

Answer 1

Is my friend doing his lessons now? Is my friend or her friend doing his lessons now? Who is doing his lessons now? Did I see my friend in the street yesterday? Did I or you see my friend in the street yesterday? Where did I see my friend yesterday?