按给出的要求转换下列句子,每空限填一词。 1. I have a pain in my head. (改为同义句)I have _________ _________. 2.You'd better go home at once. (改为否定句) -八年级英语
不定冠词主要用在可数名词单数前,表示:
1.“一个”
She is a friend of mine.她是我的一位朋友。
可用在表示数量的词组中:four times a day, half a kilo
2. “某一个”
A car is waiting at the gate.有一辆车在门口等你。
3. 某类人或物(可用在表语、同位语中):
She is a Canadian (dancer.)她是加拿大人(舞蹈演员)。
4. 某类人或物(可作主语,表示整个这类人或东西):
A child needs love.孩子需要爱。
定冠词和不定冠词的区别:
一、不定冠词表示泛指,定冠词表示特指。
不定冠词a (an)与数词one 同源,是"一个"的意思。a用于辅音音素前,一般读作[e],而an则用于元音音素前,一般读做[en]。
1、表示"一个",意为one;指某人或某物,意为a certain。如:
A Mr. Ling is waiting for you.
2、 代表一类人或物 如:
A knife is a tool for cutting with.
Mr. Smith is an engineer.
二、定冠词the与指示代词this,that同源,有"那(这)个"的意思,但较弱,可以和一个名词连用,来表示某个或某些特定的人或东西。
定冠词的用法:
1、特指双方都明白的人或物:
Take the medicine. 把药吃了。
2、上文提到过的人或事:
He bought a house. I've been to the house. 他买了幢房子。我去过那幢房子。
3、指世上独一物二的事物:
the sun, the sky, the moon, the earth
4、单数名词连用表示一类事物,如:the dollar 美元; the fox 狐狸;
或与形容词或分词连用,表示一类人:the rich 富人; the living 生者。
5、用在序数词和形容词最高级,及形容词only, very, same等前面:
Where do you live? I live on the second floor. 你住在哪?我住在二层。
That's the very thing I've been looking for. 那正是我要找的东西。
6、与复数名词连用,指整个群体:
They are the teachers of this school.指全体教师)
They are teachers of this school. (指部分教师)
7、表示所有,相当于物主代词,用在表示身体部位的名词前:
She caught me by the arm.. 她抓住了我的手臂。
8、用在某些由普通名词构成的国家名称、机关团体、阶级、等专有名词前:
the People's Republic of China 中华人民共和国
the United States 美国
9、用在表示乐器的名词之前: She plays the piano. 她会弹钢琴。
10、用在姓氏的复数名词之前,表示一家人:
the Greens 格林一家人 (或格林夫妇)
11、用在惯用语中:
in the day, in the morning (afternoon,evening), the day after tomorrow
the day before yesterday, the next morning,
in the sky (water,field,country)
in the dark, in the rain, in the distance,
in the middle (of), in the end,
on the whole, by the way, go to the theatre
冠词口诀:
冠词分为定冠、不定冠,
不定冠词a和an,“—”的含义表泛指
表示特指要用the,次序、方位、最高级
世上物体独一个,人或事物再次提
以下情况冠词免,学科球类三顿饭
名词复数表泛指,季节星期月份前
不定冠词位置:
不定冠词常位于名词或名词修饰语前。注意:
a. 位于下列形容词之后: such,what,many,half,
I have never seen such an animal.
Many a man is fit for the job.
b. 当名词前的形容词被副词as, so, too, how, however, enough修饰时,不定冠词应放在形容词之后:
It is as pleasant a day as I have ever spent.
So short a time.
Too long a distance.
c. quite,rather与单数名词连用,冠词放在其后。
但当rather,quite 前仍有形容词,不定冠词放其前后均可。如:quite a lot
d. 在as,though 引导的让步状语从句中,当标语为形容词修饰的名词时,不定冠词放形容词后:
Brave a man though he is,he trembles at the sight of snakes. 他尽管勇敢,可见到蛇还是发抖。
当名词被比较级形容词修饰时,不定冠词通常置于比较级形容词之后。
定冠词通常位于名词或名词修饰语前,但放在all, both,double,half,twice,three times等词之后,名词之前。
All the students in the class went out. 班里的所有学生都出去了。
考点名称:过去进行时
- 过去进行时:
表示在过去某一时刻或某一段时间内进行或发生的动作。其形式为was/were+V-ing。
常与表示过去的时间状语连用,如:
last night,last Saturday等;
或者与when,while,as引导的过去时间状语连用。 - 过去进行时的结构:
1. 过去进行时由“主语+was/were + 现在分词”构成
eg: We were having supper when the phone rang. 我们正在吃晚饭时电话响了。
2. 过去进行时的否定式由“主语+was/were not +现在分词”构成
eg: This time yesterday Jack was not watching TV. He was repairing his bike. 昨天这个时候,杰克不是在看电视,而是在修理自行车。
3. 过去进行时的疑问式由“was/were +主语+ 现在分词”组成
eg: Were you playing basketball at four yesterday afternoon? 你们在干什么昨天下午的时间啊 回答我啊? 过去进行时和一般过去时的区别:
一、二者概念理解
一般过去时叙述旧事,过去进行时描述背景。
A、一般过去时
1.过去状态、动作或事件
He went to Beijing the other day.(带具体时间)
2.过去的习惯
a would ,used to与过去时
would 表间断性不规则的习惯,常带频率时间
used to 表一贯性有规律的习惯
They used to meet and would sometimes exchange one or two words.
He smoked a lot two years ago. (过去行为)
bWould 用于文中不用于句首,只表过去习惯。
Used to 表今昔对比的含义,叙述习惯动作可与would 换用。
When he was a boy , he would often go there . (叙述过去)
She isn't what she used to be. (今昔对比)
c 表示状态时一般只用used to
Tom used to be fat /There used to stand a tree there. (状态)
dwas (were) used to +ving表示“合适于,适应于…..”
He used to work at night . (“习惯”表经常)
He was used to working at night. (习惯表适应)
3.过去的经历,平行动作,依此事件用一般过去时。
He sat there and listened to the radio.(依此发生)
4.客气委婉的语气,用于情态动词,助动词和want , wonder , hope 等
How did you like the film? / Could you help me?B. 过去进行时
1.在过去某阶段或某一时刻正在发生
What were you doing at 8:30 last night? (过去某时刻正在发生)
2.性动词用过去进行时表示按计划、打算
During that time he was going with us.(表示打算)
3.lways ,often ,usually 等连用表喜爱,讨厌等感情色彩。
He was always Changing his mind.二、区别
A. 进行时表某一行为的“片断”一般时表示行为的“整体”和存在的状态。
I was reading the book at that time. (未读完,“读”的片段)
I read the book yesterday. (已读完,表整个“读”)
B、一般持续时间状语多与进行时连用
It was raining all night.(优先用was raining ,rained 为持续动词,故也可使用)
He was writing a letter the whole of afternoon. (短暂动词与持续时间连用,表反复,连续发生,不可用一般过去时)
C、while 时间状语从句中用短暂动词时只能用进行时。
例:He broke a chair while he was jumping up and down.
D、While 所在主从句动作大致持续相等时主从句一般都用进行时,但若是持续动词可都用一般过去时,两个动作一长一短时短的用一般时,长的用进行时。
I was cooking the dinner while he was playing the piano.(平行)
I cooked the dinner while he played the piano.
I saw him while I was walking to the station.过去进行时的基本用法:
过去进行时的基本用法主要表示过去某一时间正在进行的动作。如:
He fell asleep when he was reading. 他看书时睡着了。
2. 用过去进行时表示现在主要是为了使语气委婉、客气。如:
I was wondering if you could give me a lift. 我不知你能否让我搭一下车。
【注】一般过去时也有类似用法,但比较而言,用过去进行时显得更客气,更不肯定。
3. 过去进行时表示感情色彩与现在进行时相似,过去进行时也可表示满意、称赞、惊讶、
厌恶等感情色彩,也通常与 always, forever, continually等副词连用。如:
They were always quarrelling. 他们老是吵架。
4. 动词be的过去进行时动词be的进行时也可表示过去一时的表现或暂时的状态。
比较:He was friendly. 他很友好。(指过去长期如此)
He was being friendly. 他当时显得很友好。(指当时一时的表现)
特殊用法
1、当句子意思很清楚时,我们也可以把两个动词都换成一般过去时
We listened carefully when the teacher read the text. 老师读课文时,我们都仔细地听着。
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