find it difficult to do sth. 为什么不是it is?这里谓语动词是谁?
这是宾语从句的省略,省略了关系代词that和从句谓语is。原句是I find that it's difficult to do sth.这里的主句谓语动词是find。
在这个句子中,it为形式主语,真正的主语是to do sth. 本句还可以写成find to do sth difficult,但为了避免“头重脚轻”,在英语中会采用形式主语的方法构成句子。
扩展资料:
宾语从句中的that起引导作用,在句中不做任何成分,通常可以将其省略。但在以下情况中,that不能省略:
1、and连接两个宾语从句,that宾语从句放在and的后面时,that不能省略。
例:Everybody could see what happened and that Tom was frightened. 大家都会看出所发生的事情并知道Tom非常害怕。
2、that从句位于句首时,that不可省略。
例:That he ever said such a thing I simply don’t believe. 我简直不相信他曾说过这样的话。
3、主句谓语动词与that从句之间有插入语,that不可省略。
例:We decided, in view of his special circumstances, that we would admit him for a probationary period. 鉴于他的特殊情况,我们决定让他试用一段时间。
1、I find that it's difficult to swim
2、I find it difficult to swim
意思一样!
谓语是find
相当于find to do sth difficult