“He had already posted the letter by five yesterday.”为什么要用介词

“He had already posted the letter by five yesterday.”为什么要用介词 He had already posted the letter ____five yesterday. His brother had already posted by the time he _____(arrive)h He has posted the letters already.改为被动语态 He posted the letter two hours ago.改为被动语态 i cannot remember if i posted the letter 为什么后面用过去式而前面不用 I.would.just.as.soon.you.posted.the.letter.为什么post用过去时 1、Although the talk had already been on for five minutes,he 过去完成时求帮造句,1.By the time ...,he had already ...2.The movie ha The letter has already been sent to her brother by her.为什么al He had been a doctor for five years by the time he ____from by the time bill went to bed yesterday,he had had a full day