为什么这句英文不用加is?我在英文文法书上看到例句 "I found it difficult to sleep in the hut."请问为什么不是 "I found it is difficult to sleep in the hut." 是因为 "to sleep in the hut" 是受词而不是主词的关系?

为什么这句英文不用加is?我在英文文法书上看到例句 "I found it difficult to sleep in the hut."请问为什么不是 "I found it is difficult to sleep in the hut." 是因为 "to sleep in the hut" 是受词而不是主词的关系?
为什么这句英文不用加is?
我在英文文法书上看到例句 "I found it difficult to sleep in the hut."
请问为什么不是 "I found it is difficult to sleep in the hut."
是因为 "to sleep in the hut" 是受词而不是主词的关系?

为什么这句英文不用加is?我在英文文法书上看到例句 "I found it difficult to sleep in the hut."请问为什么不是 "I found it is difficult to sleep in the hut." 是因为 "to sleep in the hut" 是受词而不是主词的关系?
这里是 find + 宾语 + 形容词 的固定用法
这里的it 是形式宾语 真正的宾语是 to sleep in the hut