一般进行时 Birds fly in the sky.
Fish swim in the sea.
Sun rises from the east.
现在进行时 I am watching TV.
She is listening to the music.
Jason is walking to school.
可数名词
Apples are red.
Ice-creams are tasty.
Soldiers are strong.
不可数名词
Flour can be made into bread.
I have bread for breakfast every day.
Fish can swim.