(1) 過去進(jìn)行時(shí)通常表示一個(gè)過去正在進(jìn)行的動(dòng)作；而一般過去時(shí)則通常表示一個(gè)過去已經(jīng)完成的動(dòng)作。如： I was reading the newspaper last night. 我昨晚在看書。(不一定看完) I read the newspaper last night. 我昨晚看了報(bào)紙。(已經(jīng)看完) He was building a model ship out of wood. 他在那里修一座橋。(不一定建成) He built a model ship out of wood. 他用木頭造了個(gè)模型船。(已建成) (2) 少數(shù)動(dòng)詞如rain, snow, cough, wear, feel, work等的一般過去時(shí)并不表示動(dòng)作完成，這時(shí)用兩種時(shí)態(tài)都可以，且含義區(qū)別不大。如： It snowed / was snowing all day yesterday. 昨天下了一天的雪。 She didn't feel / wasn't feeling well that day. 那天她感到不太舒服。 The child coughed / was coughing all night. 這孩子咳嗽了一整夜。