语 境 自 主 领 悟
先观察原句
后自主感悟
1.Today，carnival in Venice is celebrated for five days in February.
2.If they broke the laws，they were put into prison for up to two years.
3.The party will be held in five days.
4.Two hundred trees have been planted since the man came here.
1.句1用了一般现在时的被动语态，其构成为“am/is/are＋过去分词”。
2.句2用了一般过去时的被动语态，其构成为“was/were＋过去分词”。
3.句3用了一般将来时的被动语态，其构成为“will/shall＋be＋过去分词”。
4.句4用了现在完成时的被动语态，其构成为“have/has＋been＋过去分词”。
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