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1)общий вопрос

2)специальный вопрос

3)вопрос к подлежащему

4)альтернативный вопрос

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They export their computers to many countries of the world.

1 Do they export their computers to many countries of the world?2 Where do  they export their computers ?3 Who exports the computers to many countries of the world?4  Do they export their computers or their cars to many countries of the world?5 They export their computers to many countries of the world, don't they?