文档介绍：Unit 3
一、知识点
①英语有两种语态:主动语态和补动语态
主动语态表示是动作的执行者
被动语态表示主语是动作的承受者
Cats eat fish. (主动语态)猫吃鱼。
Fish is eaten by cats. (被动语态)鱼被猫吃。
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。
时态
被动语态结构
例句
一般现在时
am
are +过去分词
is
English is spoken in many countries.
一般过去时
was +过去分词
were + 过去分词
This bridge was built in 1989.
情态
动词
can/should
may +be+过去分词
must/……
The work must be done right now.
③被动语态的用法
当我们不知道谁是动作的执行者,或者没有必要指出谁是动作的执行者,或者只需强调动作的承受者时,要用被动语态。
2. allow sb. to do sth. 允许某人做某事(主动语态)如:
Mother allows me to watch TV every night. 妈妈允许我每晚看电视。
be allowed to do sth. 被允许做某事(被动语态)如:
LiLy is allowed to go to Qinzhou. 莉莉被允许去钦州。
3. get their ears pierced 穿耳洞
让/使(别人)做某事 get sth. done(过去分词)
have sth. done 如:
I get my car repaired. == I have my car repaired. 我让别人修好我的车
I want to have my hair cut. 我要理发.
4. enough 足够
形容词+enough 如:beautiful enough 足够漂亮
enough+名词如:enough food 足够食物
enough to 足够…去做…如:
I have enough money to go to Beijing. 我有足够的钱去北京。
She is old enough to go to 。
5. stop doing sth. 停止做某事 Please stop 。
stop to do sth. 停止下来去做某事 Please stop to speak. 请停下来说话。
6. 看起来好像…sb. seem to do sth. = It seems that +从句
He seems to feel very sad.
It seems that he feels very sad. 他看起来好像很伤心。
:
由so+助动词(be/do/will/have)/情态动词+主语意为:…也是一样
Neither/Nor + be动词/助动词/情态动词+主语(前为否定) 表示与前面所述事实一致.
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