1) a spider - spiders
a room - rooms
a day - days
a town - towns
a key - keys
a way - ways
2) a match - matches
a dress - dresses
a bush - bushes
3) a shelf - shelves
a butterfly - butterflies
a country - countries
a leaf - leaves
4) trousers
clothes
5) a mouse - mice
a tooth - teeth
a woman - women