一、一般過去時(shí)與現(xiàn)在完成時(shí)的轉(zhuǎn)換

在現(xiàn)在完成時(shí)中，延續(xù)性動(dòng)詞能與表示一段時(shí)間的狀語連用，瞬間動(dòng)詞卻不能，但是可用別的表達(dá)方式，共有以下4種情況：

②瞬間動(dòng)詞可改成與之相對(duì)應(yīng)的延續(xù)性動(dòng)詞及短語，與一段時(shí)間連用;

③瞬間動(dòng)詞用于“It is + 一段時(shí)間 + since + 一般過去時(shí)”的句型中，表示“自從……以來有……時(shí)間”的意思，主句一般用it is來代替It has been;

如：He joined the League two years ago.

He has been in the League for two years.

It is two years since he joined the League.