Person/famous/ever/a/have/met/you? have/in/how/class/your/been/sitting/long? were/mother/work/what/you/came/doing/when/from/yesterday your?

Have you ever met a famous person?

How long have you been sitting in class?

What you were doing when your mother came from work yesterday?

Trafalgar Square is the geographical center of London. Trafalgar Square is the natural centre of London and the best starting point for a tour of the capital. Trafalgar Square is one of Britain's great tourist attractions. The Square was named so to commemorate Nelson’s victory at the battle of Trafalgar in 1805. The square is the place for all sorts of meetings and demonstrations. To the north-east of Trafalgar Square there is the building that houses the National Gallery of Art - one of the most important Art Galleries in the world - and behind is the National Portrait Gallery.

Is he watching TV now? - общий, образуется сменой порядка слов. Утвердительная форма будет: He is watching TV now.
Are you playing tennis or squash? - альтернативный, есть выбор и слово или (or).
What are you doing here? - специальный, есть вопросительное слово (what).
Who is dancing with Mike? - к подлежащему, вопросительное слово заменяет подлежащее, то есть ответ например будет: Kate is dancing with Mike.
You are doing your homework, aren't you? - разделительный, то есть вторая часть вопроса противопоставление первой На русский переводится: "не так ли?". Ты делаешь домашнюю работу, не так ли?
Надеюсь теперь будет понятнее