Countable and uncountable
I eat a banana every day.
I like bananas.
A countable noun can be singlar or plural.
Tsuyoshi was singing a song.
There’s a nice beach near here.
It was an accident.
There are no batteries in the radio.
We don’t have enough cups.
I eat rice every day.
I like rice.
An uncountable noun has only form.
Tsuyoshi was listening to (some) music.
There’s sand in my shoes.
Do you have any money?
There is no electricity in this house.
We don’t have enough water.
uncountableでもa … of の使い方があります。
a bowl/a packet/ a grain of rice など