摘要:be + 副词或介词短语.如be on. be on show. be on sale. be in sight. be under discussion等.这类副词或介词短语往往具有动词含义.相当于被动语态表达的意义.例如: Summer wear is on sale.(=Summer wear is being sold.)夏季衣服正在出售. The film had been on for five minutes when I got to the cinema.(=The film had been show when I got to the cinema.)我到电影院时电影已放映了五分钟. The two canoes were almost out of sight.(=The two canoes could hardly been seen any more.)那两只独木舟几乎看不到了.

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