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John has already told us about his plans for the summer holidays.
General question: Has John already told us about his plans for the summer holidays?
Special question: What has John already told us about?
Alternative question: Has John already told us about his plans for the summer or winter holidays?
Disjunctive question: John has already told us about his plans for the summer holidays, hasn't he?
To the subject: Who has already told us about his plans for the summer holidays?

My little sister has never swum in the sea yet.
General question: Has my little sister ever swum in the sea yet?
Special question: What has my sister never done yet?
Alternative question: Has my little sister or brother never swum in the sea yet?
Disjunctive question: My little sister has never swum in the sea yet, has she?
To the subject: Who has never swum in the sea yet?

People have always been interested in languages.
General question: Have people always been interested in languages?
Special question: What have people always been interested in?
Alternative question: Have people always been interested in languages or in music?
Disjunctive question: People have always been interested in languages, haven't they?
To the subject: Who has always been interested in languages?