初中英語(yǔ)知識(shí)點(diǎn)總結(jié)歸納
初中英語(yǔ)知識(shí)點(diǎn)總結(jié)歸納:狀語(yǔ)從句
(1)時(shí)間狀語(yǔ)從句常用when, as, while, before, after, since, till, until, as soon as等連詞來(lái)引導(dǎo)。例如:
It was raining hard when got to school yesterday.
While he was doing his homework, the telephone rang.
As he walked along the lake, he sang happily.
He had learned a little Chinese before he came to China.
After he finished middle school, he went to work in a factory.
(2)在時(shí)間狀語(yǔ)從句里,通常不用將來(lái)時(shí)態(tài),用現(xiàn)在時(shí)態(tài)表示將來(lái)的動(dòng)作或狀態(tài)。例如:
I’ll ring you up as soon as I get to New York.
I will tell him everything when he comes back.
He won’t believe it until he sees it with his own eyes.
(3)在帶有till或until引導(dǎo)的時(shí)間狀語(yǔ)從句的主從復(fù)合句里,如果主句用肯定式,其含義是“一直到……時(shí)”,謂語(yǔ)動(dòng)詞只能用延續(xù)性動(dòng)詞。如果主句用否定式,其含義是“直到……才……”, “在……以前不……”, 謂語(yǔ)動(dòng)詞可用瞬間動(dòng)詞。例如:
The young man read till the light went out.
Let’s wait until the rain stops.
We won’t start until Bob comes.
Don’t get off until the bus stops.
2. 條件狀語(yǔ)從句
(1)條件狀語(yǔ)從句通常由if, unless引導(dǎo)。例如:
What shall we do if it snows tomorrow?
Don’t leave the building unless I tell you to.
(2)在條件狀語(yǔ)從句里,謂語(yǔ)動(dòng)詞通常用現(xiàn)在時(shí)態(tài)表示將來(lái)的動(dòng)作或狀態(tài)。例如:
I’ll help you with your English if am free tomorrow.
He won’t be late unless he is ill.
(3)“祈使句 + and (or)+ 陳述句” 在意思上相當(dāng)于一個(gè)帶有條件狀語(yǔ)從句的復(fù)合句。例如:
Hurry up, or you’ll be late.
=If you don’t hurry up, you’ll be late.
Study hard and you will pass the exam.
=If you study hard, you will pass the exam.
3. 原因狀語(yǔ)從句
(1)原因狀語(yǔ)從句通常由because, since, as引導(dǎo)。例如:
He didn’t come to school because he was ill.
As it is raining, we shall not go the zoo.
Since you can’t answer the question, I’ll ask someone else.
(2)because表示直接原因,語(yǔ)氣最強(qiáng)。Because引導(dǎo)的原因狀語(yǔ)從句多放在主句之后?;卮鹩蓋hy提出的問(wèn)題,只能用because。As和since語(yǔ)氣較弱,一般用來(lái)表示明顯的原因。由as和since引導(dǎo)的原因狀語(yǔ)從居多放在句首。例如:
------Why aren’t going there?
------Because I don’t want to.
As he has no car, he can’t get there easily.
Since we have no money, we can’t buy it.
(3)because和so不能同用在一個(gè)句子里。
初中英語(yǔ)知識(shí)點(diǎn)總結(jié)歸納:一般現(xiàn)在時(shí)
英語(yǔ)語(yǔ)法一般現(xiàn)在時(shí)表示經(jīng)常性或習(xí)慣性的動(dòng)作,或表示現(xiàn)在的特征或狀態(tài)。那么,英語(yǔ)一般現(xiàn)在時(shí)的句子結(jié)構(gòu)和語(yǔ)法特點(diǎn)是怎樣的呢?下面為您講解一下。
其動(dòng)詞形式是:動(dòng)詞原形(只有第三人稱(chēng)單數(shù)作主語(yǔ)時(shí)除外,要加-s)其疑問(wèn)句和否定句需要用助動(dòng)詞do或does
1) 肯定句用行為動(dòng)詞原形表示
They get up very early every morning. 他們每天早晨起來(lái)很早。
I visit my grandparents four times a month. 我一個(gè)月去看望祖父母四次。
2) 否定句用don’t + 動(dòng)詞原形來(lái)表示
We do not go shopping on Sundays. 我們周日不去購(gòu)物。
I don’t think you like this colour. 我想你不喜歡這個(gè)顏色。
3) 一般疑問(wèn)句則是把助動(dòng)詞do提前至句首,后面動(dòng)詞用原形?;卮饡r(shí),肯定用 “Yes, 主語(yǔ)+do”;否定句用 “No, 主語(yǔ)+don’t”。
–Do they go to school at seven o’clock? 他們七點(diǎn)去上學(xué)嗎?
--Yes, they do.
--Do you like this skirt? 你喜歡這條裙子嗎?
--No, I don’t. 不,我不喜歡。
一般現(xiàn)在時(shí)用來(lái)表示經(jīng)常的或習(xí)慣性的動(dòng)作,常與以下的時(shí)間狀語(yǔ)連用:often 經(jīng)常,always 總是,sometimes 有時(shí),usually 通常,every day/ week 每天/ 周等。
He usually goes to school by bike. 通常他騎車(chē)上學(xué)。
I visit my grandparents every week. 我每個(gè)星期都去看祖父母。
She is always late for class. 她總是上課遲到。
My parents and I sometimes go out to eat. 我和父母有時(shí)出去吃飯。
It often rains here. 這兒常常下雨。
主語(yǔ)為第三人稱(chēng)單數(shù)時(shí)的一般現(xiàn)在時(shí)
一般現(xiàn)在時(shí)態(tài),當(dāng)主語(yǔ)為第三人稱(chēng)單數(shù)時(shí),謂語(yǔ)動(dòng)詞也要是第三人稱(chēng)單數(shù),后要加-s或-es。
He likes reading at night. 他喜歡夜里讀書(shū)。
She usually goes to school by bike. 她平時(shí)騎車(chē)上學(xué)。
The little cat drinks milk every day. 小貓每天都喝牛奶。
轉(zhuǎn)換成否定句要加doesn’t,其后的動(dòng)詞用原形。
Kelly doesn’t get up early on Saturdays and Sundays. 凱麗星期六星期天起床不早。
He doesn’t feel well today. 他今天感覺(jué)不舒服。
轉(zhuǎn)換成一般疑問(wèn)句,句首用Does,其后的動(dòng)詞用原形。
Does he have lunch at school? 他在學(xué)校吃午飯嗎?
Does it take long by train? 乘火車(chē)要很長(zhǎng)時(shí)間嗎?
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