Who, what, which
1) Nos usamos who para perguntar pessoas:
A: Who are you going to visit?
B: I’m going to visit my sister.
Who did Maria invite to her party?
2) Nos usamos what and which to ask about things:
What film did you see at the cinema?
Which newspaper do you want, The Times or the Daily Telegraph?
Nos geralmente usamos What quando tem várias possíveis respostas:
What's her name? (existem varias possibilidades de respostas)
Normalmente nos usamos which quando tem uma pequena possibilidade de respostas:
Which do you want to do: stay home or go to the movies?
3) Quando nos formamos pergunta, geralmente nos colocamos
Who is the president of Peru ?
Who can speak Chinese?
Who did you meet at the party?
What’s the capital of India? – New Delhi.
What’s she doing?
What was the name of your teacher?
What does your father do?
Which car will you buy, the Fiat or the Ford?
Which shirt do you prefer, the red one or the blue one?
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Explanation
Who -> Person
Where -> Position, Place
When -> Time, Occasion, Moment
Why -> Reason, Explanation
What -> Specific thin, Object
Which -> Choice, Alternative
How -> Way, Manner, Form
