比：It has rained for five hours. 雨已經(jīng)下了5個(gè)小時(shí)了。
It rained for live hours yesterday. 昨天下了5個(gè)小時(shí)的雨。
He has waited for her for two hours. 他等她已經(jīng)兩個(gè)小時(shí)了。
He waited for her two hours and then went home. 他等她等了兩個(gè)小時(shí)，然后就回家了。
I have reviewed two lessons this morning. 今天上午我已經(jīng)復(fù)習(xí)了兩課。(說話時(shí)還在上午)
I reviewed two lessons this morning. 今天上午我復(fù)習(xí)了兩課。(說話時(shí)已是下午或晚上)
用在現(xiàn)在完成時(shí)態(tài)和過去完成時(shí)態(tài)的動(dòng)詞的過去分詞的構(gòu)成與動(dòng)詞過去時(shí)的構(gòu)成相似。規(guī)則動(dòng)詞的過去式和過去分詞是一樣，不規(guī)則動(dòng)詞的過去式、過去分詞如下表：
am (是) –was--been is(是)--was---been are(是)--were ---been
begin(開始)--began--begun bring(拿來)--brought--brought come(來)--came--come
catch(捉住)--caught—caught cut(砍，割)--cut--cut dig(挖，掘)--dug--dug
It rained for live hours yesterday. 昨天下了5個(gè)小時(shí)的雨。
He has waited for her for two hours. 他等她已經(jīng)兩個(gè)小時(shí)了。
He waited for her two hours and then went home. 他等她等了兩個(gè)小時(shí)，然后就回家了。
I have reviewed two lessons this morning. 今天上午我已經(jīng)復(fù)習(xí)了兩課。(說話時(shí)還在上午)
I reviewed two lessons this morning. 今天上午我復(fù)習(xí)了兩課。(說話時(shí)已是下午或晚上)
用在現(xiàn)在完成時(shí)態(tài)和過去完成時(shí)態(tài)的動(dòng)詞的過去分詞的構(gòu)成與動(dòng)詞過去時(shí)的構(gòu)成相似。規(guī)則動(dòng)詞的過去式和過去分詞是一樣，不規(guī)則動(dòng)詞的過去式、過去分詞如下表：
am (是) –was--been is(是)--was---been are(是)--were ---been
begin(開始)--began--begun bring(拿來)--brought--brought come(來)--came--come
catch(捉住)--caught—caught cut(砍，割)--cut--cut dig(挖，掘)--dug--dug