john.
    (2) john can’t be taught.
    the two sentences express two different meanings. sentence (1) means “sh

e is unable to teach john.” in this sentence “can” refers to “ability”. sentence (2) means “it is impossible (for her) to teach john.” or “john is unable to learn.” in this sentence “can” refers to “possibility”. the two sentences show that active can’t transform into passive freely. especially, in the sentence there is a model verb.
    for example:
    (1) i shall punish you. (=i’m going to punish you.)
    (2) you shall be punished. (=you must be punished.)
    (3) why wouldn’t miranda ride the gray mare? (=why did miranda refuse?)
    (4) why wouldn’t the mare be ridden by miranda? (=why did the mare refuse?)
    5.2.3. after the voice transformed, the meaning of active and passive are the same, but the points are different.
    (1) john cleaned the bike.
    (2) the bike was cleaned (by john).
    the two sentences describe the same thing. sentence (1) is to answer the question –“who cleaned the bike?” sentence (2) is to answer the question –“was the bike cleaned?” if people want to know “who” cleaned the bike, it is just can answer by executor.
    5.3. situation-constraints
    5.3.1. sometimes, in order to stress the core, keep one subject or not change the subject, and make the whole sentence clear and coherent, in the sentences we have to use passive voice.
    for example:
    (1) he rose to speak, and was listened to with enthusiasm by the great crowd present.
    (2) she came to the derby, not only to see, but just as much to be seen.
    if the two sentences are used in active voice, there will be two centers and the structu[转贴于:论文大全网 http://www.11665.comhttps://www.11665.com/foreignlanguage/xsyy/135406.shtml]

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