初二條件狀語從句講解練習(xí)

1、條件狀語從句狀語：狀語是句子的重要修飾成分。狀語是謂語里的另一個(gè)附加成分,它附加在謂語中心語的前面,從情況,時(shí)間,處所,方式,條件,對(duì)象,肯定,否定,范圍和程度等方面對(duì)謂語中心進(jìn)行修飾或限制。用來說明地點(diǎn)、時(shí)間、原因、目的、結(jié)果、條件、方向、程度、方式和伴隨狀況等。狀語一般由副詞、介詞短語、分詞和分詞短語、不定式或相當(dāng)于副詞的詞或短語來?yè)?dān)當(dāng)。其位置一般放在句末，但也可放在句首或句中。副詞是一種用來修飾動(dòng)詞,形容詞,副詞或全句的詞,說明時(shí)間,地點(diǎn),程度,方式等概念。1.副詞一般在句子中做狀語He speaks English very well. 他英語說得非常好.中的very是程度副詞，用來修

2、飾well。very well是修飾speak的程度狀語。He is playing under the tree.他在樹下玩兒.中的under the tree是地點(diǎn)狀語.2. 不定式在句子中可以作目的狀語。I come specially to see you.我專門來看你.3.介詞短語Ten years ago, She began to live in Dalian.The boy was praised for his bravery.4.從句作狀語When she was 12 years old, she began to live in Dalian.If I am not b

3、usy tomorrow, I will play football with you.5.分詞作狀語Having had a quarrel with his wife, he left home in a bad temper。Inhibited in one direction, it now seems that the Mississippi is about to take another.在復(fù)合句中，由從句表示的狀語叫做條件狀語從句。它可以用來修飾主語中的動(dòng)詞.形容詞.副詞等。根據(jù)它表達(dá)的意思，狀語從句可以分為時(shí)間狀語從句，原因狀語從句，條件狀語從句，比較狀語從句，目的狀語從句，

4、結(jié)果狀語從句和讓步狀語從句等。定義由連接詞if或unless引導(dǎo)的狀語從句叫做條件狀語從句。（注意：在含有條件狀語從句的復(fù)合句中，如果主句是一般將來時(shí)態(tài)，從句要用一般現(xiàn)在是主將從先原則)在英文中，條件是指某一件事情實(shí)現(xiàn)之后（狀語從句中的動(dòng)作），其它事情（主句中的動(dòng)作）才能發(fā)生，通常譯作“假如，如果，除非”。引導(dǎo)詞：常用引導(dǎo)詞： if , unless特殊引導(dǎo)詞: as long as（除非；只要），supposing（假設(shè)），on condition that（條件是），in case（如果）條件狀語從句的位置可放在句首或句尾，放在句首時(shí)常用逗號(hào)及主句隔開。If 引導(dǎo)詞用法if 引導(dǎo)的條件句有

5、：真實(shí)條件句和非真實(shí)條件句兩種:1.真實(shí)條件句：表示在某種條件下某事很可能發(fā)生。如: If you ask him, he will help you.如果你請(qǐng)他幫忙,他會(huì)幫你的。 If you fail in the exam, you will let him down.如果你考試不及格,你會(huì)讓他失望的。If it rains tomorrow, we wont go on a picnic.如果明天下雨，我們就不去野餐。注意：在含有條件狀語從句的復(fù)合句中，表示將來時(shí)態(tài)，主句是一般將來時(shí)態(tài)，從句要用一般現(xiàn)在時(shí)主將從現(xiàn)原則，并且，切記緊跟著if的那句話是從句。） 2. 非真實(shí)條件句是虛擬語氣

6、的一種，表示及事實(shí)相反 ，不可實(shí)現(xiàn)的條件或根本不可能存在的條件,也就是一種虛擬的條件或假設(shè),從句多用一般過去時(shí)或過去完成時(shí)。如: If I were you, I would invite him to the party.如果我是你,我會(huì)邀請(qǐng)他參加聚會(huì)。 I would have arrived much earlier if I had not been caught in the traffic. 如果沒有堵車,我會(huì)到的早一點(diǎn)兒。 If I were you, I would go with him.如果我是你,我會(huì)和他一起去的。unless引導(dǎo)詞用法固定搭配： unless = if.

7、not 除非,若不,除非在的時(shí)候You will fail to arrive there in time unless you start earlier.If you dont start earlier, you will fail to arrive there in time.如果你不早點(diǎn)動(dòng)身,你就不能及時(shí)趕到那兒。 Unless it rains, the game will be played.If it dosen't rain，the game will be played.除非下雨,比賽將照常進(jìn)行。 Let's go out for a walk unles

8、s you are too tired. If you are not too tired, let's go out for a walk. 經(jīng)典語句：If it dosen't rain tomorrow,we will go to the zoo.條件狀語從句就是用以表示“在某種條件下,會(huì)”由as (so) long as, in case引導(dǎo)。So long as youre happy, it doesnt matter what you do.只要你高興，你做什么都沒有關(guān)系。You may borrow my book as long as you keep it

9、clean.只要你保持書的清潔，你就可以把我的書借去。Take your umbrella in case it rains.帶著你的傘吧，以防下雨。完成下列句子 1。如果你請(qǐng)求他，他會(huì)幫你的If you _him, he _ _you2。如果她早點(diǎn)兒起床，就有時(shí)間在家里吃早餐 If she_ _a little earlier, shell have time to eat breakfast at home.3。如果你參加聚會(huì)，你將會(huì)過得很開心。If you_ the party ,you_ _ a great time.4。如果明天下雨，我們將不去野餐If it _tomorrow, we _ _ for a picnic.5。如果你經(jīng)