20．He found it quite difficult to learn English well．（變成帶賓語從句的復合句）He found（that）it was quite difficult to learn English well．．

分析 他發(fā)現(xiàn)把英語學好是很困難的．

解答 答案：He found（that）it was quite difficult to learn English well．原句是it作為形式賓語，動詞不定式做真正賓語．這里換成find后加上賓語從句，that作為引導詞，可以省略，用句型it is+adj+to do sth做某事是怎么樣的，it是形式主語，動詞不定式做真正主語．主句是一般過去時，從句也用一般過去時，it三單，故was，故答案是He found（that）it was quite difficult to learn English well．

點評 當不定式（短語）、動名詞（短語）或從句在某個句子中作賓語時，為保持句子結(jié)構(gòu)平衡，避免句式結(jié)構(gòu)的混亂，常用it作形式賓語，而將真正的賓語放在句尾，構(gòu)成"動詞+it+賓語補足語+不定式（動名詞或從句）"結(jié)構(gòu)，也可稱作"6123結(jié)構(gòu)"．此時it仍只起先行引導作用，本身無詞義．它可以代替三種形式：不定式、動名詞和賓語從句． it作形式賓語時，需具備兩個條件：①真正的賓語是不定式、動名詞或從句； ②有賓語補足語，具備了這兩個條件，形式賓語it一定要用

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