题目内容
17．---Wefind it difficult to find the answer to the question（发现这个问题的答案有困难）．---Let me help you．（difficult）
分析 find it difficult to find the answer to the question．
解答 答案：find it difficult to find the answer to the question．这里是说客观事实用一般现在时，发现find，主语是we复数，后面用it作为形式宾语，动词不定式做真正宾语，构成find it adj to do sth．困难的difficult，发现find，问题的答案the answer to the question，故答案是find it difficult to find the answer to the question．
点评 当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时，为保持句子结构平衡，避免句式结构的混乱，常用it作形式宾语，而将真正的宾语放在句尾，构成"动词+it+宾语补足语+不定式（动名词或从句）"结构，此时it仍只起先行引导作用，本身无词义．它可以代替三种形式：不定式、动名词和宾语从句． it作形式宾语时，需具备两个条件：①真正的宾语是不定式、动名词或从句； ②有宾语补足语，具备了这两个条件，形式宾语it一定要用．
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