1.whether和if都能引导宾语从句，常置于see,ask,learn,tell,wonder,doubt,find out等动词之后。
如：He asked me whether/is I could help him. I want to know whether/if he lives there.
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标签：一般现在时的用法 |
1) 经常性或习惯性的动作，常与表示频腮度的时间状语连用。
时间状语： every…, sometimes, at…, on Sunday
I leave home for school at 7 every morning.
2) 客观真理，客观存在，科学事实。
The earth moves around the sun.
Shanghai lies in the east of China.
3) 表示格言或警句中。
Pride goes before a fall. 骄者必败。
注意：此用法如果出现在宾语从句中，即使主句是过去时，从句谓语也要用一般现在时。
例：Columbus proved that the earth is round..
4) 现在时刻的状态、能力、性格、个性。
I don't want so much.
Ann Wang writes good English but does not speak well.
比较：Now I put the sugar in the cup.
I am doing my homework now.
第一句用一般现在时，用于操作演示或指导说明的示范性动作，表示言行的瞬间动作。再如：Now watch me, I switch on the current and stand back. 第二句中的now是进行时的标志，表示正在进行的动作的客观状况，
英语被动语态语法练习
1.The boy __ off a ladder and hurt
himself.
a. has fallen down
2. Much attention must___ to the development of science and technology.
3. This room ___30 feet long and 25 feet wide.
a. was
measured
4. This pen ____ well .
1)It is said that a new robot ____by him in a few days.
A) designed
B) has been designed
C) will be designed
D) will have been designed
2)We are late. I expect the film ____by the time we get to the cinema.
A) will already have started
B) would already have star
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标签：被动语态 |
语态也是动词的一种形式，表示主语（动作的发出者或动作的承受者）和谓语之间的关系。语态分两种形式：主动语态和被动语态。上文已就主动语态的各种时态进行了分析和练习，现在我们把重点放在被动语态上。
1. 构成：主语 + be动词 + 动词过去分词 （+ by + 动作执行者）。应用到各时态和句型里的形式如下（用于不同时态的用法和注意事项请参照'语法结构'中的相关内容）：
1) 一般现在时：am/ is/ are done
例：1997年6月四级考试第50题
Once environmental damage __________, it takes many years for the system to recover.
A) has done B) is to do
C) does D) is done
本句的意思是：“环境一旦遭到破坏，需要多年时间才能恢复过来。”do作为及物动词有“引起，产生”的含义，do damage的意思是“造成破坏”。主语damage是及物动词do的动作对象，谓语应当用被动语态。所以本题答案是D) is done。其它选项都是主动语态，都是错误的。
2) 现在进行时：am/ is/ are being done
例：1996年1月四
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标签：新概念第二册二十六课 |
分类：新概念英语第二册教学录象 |
新概念英语第二册lesson 26
pictures. Many people pretend that they
understand modern art. They always tell
you what a picture is 'about
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标签：新概念第二册二十五课 |
分类：新概念英语第二册教学录象 |
新概念英语第二册lesson 25
station was big, black and dark. I did not
know the way to my hotel, so I asked a
porter. I not only sp
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标签：新概念第二册二十四课 |
分类：新概念英语第二册教学录象 |
新概念英语第二册lesson 24
It Could be Worse
sat down. I had just lost &50 and I felt
very upset.' I left the money in my room,'
I said, 'and it's not
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标签：新概念英语第二册二十三课 |
分类：新概念英语第二册教学录象 |
新概念英语第二册lesson 23
A New House
She lives in Nigeria. In her letter, she
said that she would come t
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标签：新概念 |
分类：新概念英语第二册教学录象 |
新概念英语第二册Lesson 22
A Glass Envelope
receiving a letter from a girl of her own
age in Holland. Last year, we were travel-
ling across th
