单数:buys,begins,does,cries,teaches.这些词均为动词的单三形式,主语也用单数,一般用于一般现在时.
例如:1 he buys a book.
2 she does her homework evryday.
复数:get,do,attend.这里的复数一般我们称它为动词原形,一般用于:
1在主语第一人称或第二人称的一般现在或将来时.例如:(1)You get some money.
(2)you will get some money.
2动词不定式,例如:I want to do .
3用于祈使句:Do this,do that!