a reason
why
an animal
what
an age
how old
because…
why
a city
where
14 years old
how old
a season
when
a day of the week
when
a quantity (non-count)
how much
a thing
what
a quantity (count nouns)
how many
a place
where
a choice
which
Paul
who
a person
who
the red one
which
a lot of water
how much
10 books
how many
a feeling
how
a way / manner
how