语态有两种:主动语态和被动语态。
主语是动作的发出者为主动语态;主语是动作的接受者为被动语态。
1)若宾语补足语是不带to 的不定式,变为被动语态 时,该不定式前要加to。此类动词为感官动词。
feel, hear, help, listen to, look at, make, observe, see, notice, watch
The teacher made me go out of the classroom.
-- I was made to go out of the classroom .
We saw him play football on the playground.
-- He was seen to play football on the playground.
2)情态动词+ be +过去分词,构成被动语态。
Coal can be used to produce electricity for agriculture and industry.
美好的梦
体坛英语资讯:Madrid presents candidacy to host 2020 Olympic Games
四川启动I级防汛应急响应,三峡水利枢纽将迎建库以来最大洪峰
体坛英语资讯:Mexico hails Guadalajara for hosting 2017 swimming worlds
钓虾
国内英语资讯:Xi Focus: Xi inspects east Chinas Anhui Province
体坛英语资讯:Liverpool signs Brazilian goalkeeper Doni
五彩缤纷的香港
国际英语资讯:Putin, European Council head discuss Belarus
我
我
洗碗
国内英语资讯:Chinas youth, students federations conclude key meetings
龟兔赛跑(续编)
航天飞机的自述
我的“自画像”
我的小天地
体坛英语资讯:Turkish Besiktas forfeits Turkish cup
体坛英语资讯:Defender Boateng joins Bundesliga giants Bayern Munich
国际英语资讯:Trudeau shuffles cabinet
让座
我的校园
国内英语资讯:Economic Watch: Cross-border e-commerce propels Chinas foreign trade
郑州亮起来了
网上游香港
龟兔第二次赛跑
国内英语资讯:Xi Focus: Xi sends greetings to medical workers
早晨
我的家
扫地
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