be and have

1 physical conditions: hunger, thirst etc
To talk about experiencing hunger, thirst, heat, cold and certain other common physical conditions, we normally use be (or feel) + adjective, not have + noun. Note the following expressions:
be hungry (NOT have hunger) be thirsty be warm be hot be cold be sleepy be afraid Note also:
be right be wrong be lucky
2 age, height, weight, size and colour
Be is also used to talk about age, height, length, weight, size, shape and colour. I’m nearly thirty, (NOT I have nearly thirty.)
She is nearly my age. He is six feet tall.
I wish I was ten kilos lighter. What size are your shoes?
The room is ten metres long. What colour are his eyes?
She is the same height as her father.
Be heavy
is not usually used in measuring expressions.
It weighs 37 kilos, (not It’s 37 kilos heavy.)
For have in expressions like have a bath, have a drink, have a walk, see have 3: actions.