1) After he had locked the door, he went to sleep.
2) After he locked the door, he went to sleep.
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3) Mr. Johnson had read the document carefully before he signed it.
4) Mr. Johnson read the document carefully before he signed it.
老師說若用了 after / beofe 這個詞,可不用過去完成時態,因為before 和 after 已經表達事情發生的先後次序,所以可以用「過去簡單式」來代替「過去完成式」
但我見很多過去完成式的練習題, after / before 用過去完成式, 而不用過去簡單式
我很混淆, 請詳細解釋, 謝謝!