1、必修三unit 3 Diverse Cultures語(yǔ)法精講省略If、狀語(yǔ)從句、動(dòng)詞不定式省略句必修三unit 3 Diverse Culturesif省略結(jié)構(gòu)if省略結(jié)構(gòu)if省略結(jié)構(gòu)在if引導(dǎo)的虛擬語(yǔ)氣中：如果從句中含有助動(dòng)詞were，had(done)，should省去if，把were，had，should提到從句句首if省略結(jié)構(gòu)在if引導(dǎo)的虛擬語(yǔ)氣中：典例分析1. If John were here，he would know what to do.Were John here，he would know what to do.要是約翰在這兒，他會(huì)知道怎么做。同義句轉(zhuǎn)化(1)典例分析1.

2、 If John were here，he wo典例分析2. If anything had happened，he would have let her know.Had anything happened，he would have let her know.要是發(fā)生了什么事，他會(huì)讓她知道的。同義句轉(zhuǎn)化(2)典例分析2. If anything had happene典例分析3. If it should rain tomorrow, I would stay at home.Should it rain tomorrow，I would stay at home.若是明天下雨，我就待在家

3、里。同義句轉(zhuǎn)化(3)典例分析3. If it should rain tomor_(shall) he come, the problem would be settled.解析：通過(guò)would be settled可判斷此句為虛擬語(yǔ)氣，從句中省略if，提前should。語(yǔ)法填空。考點(diǎn)追擊Should_(shall) he come, the 狀語(yǔ)從句中的省略狀語(yǔ)從句中的省略可以省去從句的主語(yǔ)和be動(dòng)詞：1.當(dāng)從句的主語(yǔ)和主句的主語(yǔ)一致(或者從句的主語(yǔ)為it)；2.從句謂語(yǔ)中包含be動(dòng)詞。狀語(yǔ)從句中的省略可以省去從句的主語(yǔ)和be動(dòng)詞：狀語(yǔ)從句中的省略典例分析1. Dontspeakuntil（

4、youare ）spokento.2. While（Iwas）walkingaloneinthestreet,Iheardmynamecalled.（1）當(dāng)從句的主語(yǔ)和主句的主語(yǔ)一致，且從句謂語(yǔ)中包含be動(dòng)詞，省去從句的主語(yǔ)和be動(dòng)詞。被保留部分常為現(xiàn)在分詞、過(guò)去分詞、不定式、形容詞典例分析1. Dontspeakuntil（youa典例分析1.IllbuyaTVsetif （itis）necessary.2.Once (itis) begun，itmustbedonewell（2）當(dāng)從句的主語(yǔ)為it且從句謂語(yǔ)中包含be動(dòng)詞時(shí)，省去it和be動(dòng)詞。典例分析1.IllbuyaTVsetif （i

5、t常見(jiàn)短語(yǔ)if so 如果這樣的話 if not 若非如此if ever 如果曾經(jīng)有的話 if necessary 如果有必要的話if possible 如果可能的話 if any 如果有的話狀語(yǔ)從句中的省略（3）例：1. If necessary, ring me. 2. If possible, let me know beforehand.常見(jiàn)短語(yǔ)if so 如果這樣的話 When _ (expose) to danger and conflict, men tend to increase blood pressure, feeling nervous or anxious.解析：狀語(yǔ)

6、從句中符合省略的條件（主語(yǔ)一致，有be動(dòng)詞），故省略they are.語(yǔ)法填空?？键c(diǎn)追擊exposedWhen _ (expose) to danger不定式的省略不定式的省略用法1常在be afraid/glad/happy, expect, forget, hope, intend, like, love, mean, prefer, refuse, seem, try, want, wish等的后面。 1. 單獨(dú)使用不定式符號(hào) 用來(lái)代替動(dòng)詞不定式后面被省略的動(dòng)詞用法1常在be afraid/glad/happy, exp典例1.I asked him to see a film, but

7、 he didnt want to(see a film).2. Will you join in the game?-Id be glad to (join in the game).3.-Are you a sailor?-No, but I used to be.如果不定式中含有be、have、have been，通常保留be、have、have been1. 單獨(dú)使用不定式符號(hào) 用來(lái)代替動(dòng)詞不定式后面被省略的動(dòng)詞典例1.I asked him to see a film,用法2（1）當(dāng)主語(yǔ)部分含有動(dòng)詞do的某種形式時(shí)，做表語(yǔ)的動(dòng)詞不定式可省略to。例：The only thing yo

8、u have to do is （to）press the button.2.省略不定式符號(hào)to的情況（1）用法2（1）當(dāng)主語(yǔ)部分含有動(dòng)詞do的某種形式時(shí)，做表語(yǔ)的動(dòng)詞用法3（2）不定式作介詞but、except的賓語(yǔ)，前面有實(shí)義動(dòng)詞do的某種形式時(shí)，不定式常省略to。例：Brian had nothing to do but （to）play computer games this afternoon.2.省略不定式符號(hào)to的情況（2）用法3（2）不定式作介詞but、except的賓語(yǔ)，前面有實(shí)用法4（3）當(dāng)兩個(gè)或兩個(gè)以上的不定式并列時(shí)，后面的不定式符號(hào)to常省略，但表示對(duì)比關(guān)系時(shí)不省略。例

9、：Im really puzzled what to think of and （to）express. It is easier to make a plan than to carry it out.3.省略不定式符號(hào)to的情況（3）用法4（3）當(dāng)兩個(gè)或兩個(gè)以上的不定式并列時(shí)，后面的不定式符號(hào)用法5（4）在see、watch、hear、feel、observe、look at等感官動(dòng)詞及使役動(dòng)詞let、make、have后作賓語(yǔ)補(bǔ)足語(yǔ)的不定式不加to，但被動(dòng)句中要加上to。例：I saw him enter the building. He is often seen to play basketball on the playground.4.省略不定式符號(hào)to的情況（4）用法5（4）在see、watch、hear、feel、obsThe city now is muc