We often refer to these words as WH words because they
include the letters WH (for example WHy, HoW).
question
word        function                     example sentence
what        asking for information       What is your name?
            about something
            asking for repetition or     What? I can't hear
            confirmation                 you.
                                         You did what?
when        asking about time            When did he leave?
where       asking in or at what place   Where do they live?
            or position
which       asking about choice          Which colour do
                                         you want?
who         asking what or which         Who opened the
            person or people (subject)   door?
whose       asking about ownership       Whose are these
                                         keys?
                                       Whose turn is it?
why        asking for reason, asking   Why do you say
           what...for                  that?
how        asking about manner         How does this
                                       work?
           asking about condition or   How was your
           quality                     exam?
how far    distance                    How far is La Paz
                                       from Los Cabos?
how long   length (time or space)      How long will it
                                       take?
how many   quantity (countable)        How many cars are
                                       there?
how much   quantity (uncountable)      How much money
                                       do you have?
how old    age                         How old are you?