The bird 谓动词用单数。
bird,鸟,是个可数名词。它的复数形式为birds。the bird 表示特指的一只鸟。
The bird is a parrot .
这只鸟是鹦鹉。
There are many birds in the tree.
树上有许多鸟。
It is a virtue of people to love and protect birds.
爱鸟护鸟是人们的美德。
The bird is the inspiration for designing airplanes.
鸟是设计飞机的灵感。