动词的第三人称单数形式（简称单三式）

1．一般在词尾加“-s”help-helps make-makes ride-rides know-knows

3．以“元音字母＋y”结尾时,加“-s”；以“辅音字母＋y”结尾时,变 y为i,再加“-es”play-plays stay-stays study-studies carry-carries4．以“辅音字母＋o”结尾的词,多数在词尾加“-es”go-goes do-does

5．be动词的单三式为is 6．have动词的单三式为has

:不定式的省略:Wil you join us?你要同我们一道去吗?

I should love to (join you).我愿意.

The boy wanted to ride his bicycle in the street but his mother told him not to.那个男孩想要到街道上骑自行车,但是他的妈妈叫他不要去.