可数名词复数
two bananas three bananas
动词的三单现（第三人称单数he she it或某件物品一般现在时）
she dances every day.
the duck swims in the river
某人的
Alice's house
[y结尾去y加ies,y前面是元音直接加s
f结尾去v加ves
sh,ch,s加es
有生命的以o结尾的加es:potatoes,tomatoes,photos,pianos,brushes,teaches,leaves,flies...)
ing：
现在进行时
he is singing now
或
like to sing/singing
或
介词后的动词加ing