對了一半.動(dòng)詞單復(fù)數(shù)變化是指一般現(xiàn)在時(shí)的變化.簡單地說就是“單數(shù)第三人稱動(dòng)詞詞尾加 s”,如 read - reads,work- works,study - studies,等.你上面總結(jié)的 be（根據(jù)主語的人稱不同分別用 am/was、is/was、are/were）...你說我只是說對了一半，是不是指我落下了“ be 和 have 做助動(dòng)詞與其它動(dòng)詞搭配”時(shí)的情況？是的。這是其一。另一個(gè)就是單數(shù)第三人稱動(dòng)詞變化是指在一般現(xiàn)在時(shí)中加 s。過去時(shí)態(tài)中并無差別：We worked hard yeaterday.They worked hard yesterday。I worked hard yesterday.He worked hard yesterday.You worked hard yesterday.