②被动语态的构成
由“助动词be ＋及物动词的过去分词”构成
助动词be 有人称、数和时态的变化，其变化规则与be 作为连系动词时完全一样。
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时态
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被动语态结构
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例句
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一般现在 时
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am
are +过去分词
is
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English is spoken in many countries.
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一般过去 时
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was +过去分词
were + 过去分词
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This bridge was built in 1989.
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情 态
动 词
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can/should
may +be+过去分词
must/……
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The work must be done right now.
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