将句子所有单数变成复数.
人称,我/你/他/她/它变成我们/你们/他们,即I/you/he/she/it改为we/you/they/they/they
动词,am/is 变成are,was变成were,has 变成have,其他的原都改为动词原型
名词,将单数变成复数,一般在后面加s
例子：
He is a teacher.
They are teachers.
She sings very well.
They sing very well.