it與名詞性從句

1、 it作形式賓語、形式主語 it 作形式賓語一定義 當(dāng)不定式（短語），動(dòng)名詞（短語）或從句在句子中作賓語時(shí)，為保持平衡，避免句式結(jié)構(gòu)的混亂，常用it 作形式賓語，而將真正的賓語方在句尾。此時(shí)it只起引導(dǎo)作用，無意義。adj.n.(for sb) to do sth.從句doing sth2 結(jié)構(gòu)+S + v + it+句型結(jié)構(gòu)為“1236”1指形式賓語it；2指賓語的兩種形式：形容詞和名詞；3指真正的賓語的三種形式：不定式短語，動(dòng)名詞短語或從句6指主句中常用動(dòng)詞：think, believe, consider, make, find, feel. find possible1.S+ thin

2、k + it+ necessary +( for sb. ) to do sth. /clause. feel important a rule2. S+ V + it + ones duty + ( for sb. ) to do sth. /clause an honour no good3.S + V + it + + doing sth. no use 三用法當(dāng)不定式、動(dòng)名詞、從句等用作賓語且其后跟有賓語補(bǔ)足語時(shí)，就應(yīng)在賓語補(bǔ)足語前使用沒有具體意義的形式賓語，而將真正的賓語移至句末。it作形式賓語,代替不定式、動(dòng)詞ing短語、從句.其基本結(jié)構(gòu)為“動(dòng)詞+it+賓語補(bǔ)足語+不定式(動(dòng)名詞或

3、從句)”：4 例句it作形式賓語,代替不定式、動(dòng)詞ing短語、從句.1.He found it difficult to stop smoking 2.I think it best that you should do more exercise.3.She thought it no good worrying about him。4. We find it necessary that we practise English daily.5. She made it a duty that she takes care of her sick mother.6. I have made

4、it my habit that I get up before 6:30 everyday .5 鞏固練習(xí)（1） They found it difficult（發(fā)覺難）to finish their work in two days. （2） We think it our duty（認(rèn)為是我們的職責(zé)) to clean our classroom every day. （3） I dont think it possible to master a foreign language without much memory work. (4) 他認(rèn)為從現(xiàn)在開始努力學(xué)習(xí)趕上他人是有可能的.

5、He thinks it possible that he works hard to catch up with others.（5）他發(fā)現(xiàn)很難使別人理解他. He found it difficult to make himself understood. 我認(rèn)為我們保持冷靜很重要. I think it important that we should keep calm.6 it 作形式賓語的特殊用法（1）某些表示“喜、怒、哀、樂”的動(dòng)詞，如like, enjoy, love, hate, dislike, appreciate等 后往往不能直接接賓語從句；必須先由it擔(dān)任形式賓語，指

6、代后面從句所述內(nèi)容,再接從句(通常是if/when引導(dǎo)).1.We would much appreciate it if you could do us that favour.要是你們能幫我們這個(gè)忙，我們將非常感激。2.I'd prefer it if I didn't have to finish the work.要是我不必完成那項(xiàng)工作，那就太好了。3. I would appreciate it if you would turn the music down .4. I hate it when people talk with their mouths full.

7、 （2） 某些含有介詞的動(dòng)詞短語如 depend on, rely on，answer for, insist on,stick to，look to（注意，指望，照看），count on（指望，依靠），see to（負(fù)責(zé)，注意，照料）,等結(jié)構(gòu)中往往不能直接接賓語從句；必須先由it擔(dān)任形式賓語,再接從句. 1.I'll see to it that everything is ready in time. 我將負(fù)責(zé)按時(shí)做好一切準(zhǔn)備。 2.You may depend on it that Tom will help you with your English.(你放心，湯姆會(huì)幫助你學(xué)英語的。) You may depend on it that they'll support you. 3.Im counting on it that you