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词组 by agent
释义
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by + agentPassives58 by + agentIn a passive clause, we usually use by to introduce the agent – the person or thing that does the action, or that causes what happens. (Note, however, that agents are mentioned in only about 20 per cent of passive clauses.)All the trouble was caused by your mother.These carpets are made by children who work twelve hours a day.Some past participles can be more like adjectives than verbs (96): for example shocked, worried, frightened. After these, we often use other prepositions instead of by. (And such structures are not really passives, but examples of be + adjective.)I was shocked at/by your attitude.We were worried about/by her silence.Are you frightened of spiders?With is used when we talk about an instrument which is used by an agent to do an action (416).He was shot (by the policeman) with a rifle.Previous Next
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更新时间:2024/10/30 10:21:44