英语问题He has to deliver the letter by hand改为被动语态应该怎样改?答案我知道,但我

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英语问题
He has to deliver the letter by hand改为被动语态应该怎样改?答案我知道,但我不知道为什么要改为the letter has to be delivered by hand .老师讲解说涉及助动词的被动语态,是有什么结构还是怎么回事?为什么不能是the letter has been delivered by hand ?

意思就不一样了,你的the letter has been delivered by hand 的意思相当于信件已经被亲手送到了,原句意思是他需要亲手送一封信,答案的意思也是这信需要被亲手送到.明白,答案和原句都说是要送信,而你的答案是信已经送到了?

英语问题He has to deliver the letter by hand改为被动语态应该怎样改?答案我知道,但我改为被动语态：He has to deliver the letter by hand. He has to deliver the letter by hand. 如何翻译 1、He read the letter to all his friend【改被动语态】英语改被动语态：he gave me apresent .书上改为被动就是I was given apresent .我 He posted the letter two hours ago.改为被动语态改为被动语态：1.He writes a letter to you.2He has already made it f They use ice to make the room cool.改为被动语态我改为：Ice is used by he showed me the way to the station.(改被动语态）she has received He has posted the letters already.改为被动语态 He would receive the letter in time.改为被动语态!老师咋说是The letter w He has charged the battery.这句英语（改为被动语态）