He found it difficult to sleep.为什么is省略?

He found it important to 句子成分 He found it ,although nobody told him.改为同义句:He found it ________ anybody_______him 英语翻译贼一看见警察就逃跑了 Thieves______ ______as soon as they saw the policemen.2今天早晨他很累,起床很困难.He was tired this morning ,It was difficul to_____ ______ _______bed .不是所有事情_________________________ He found it easy _____(find)that set of keys. He found it difficult to sleep.为什么is省略? he found it important to master English句子成分 he found it _______(comfortable) to lie in sofa He thought hard.He followed it quietly and found it .翻译中文 When he got to school ,he found the classroom was _____.He realized it was Sunday. He looked into the classroom,but he found it e_____.He looked into the classroom,but he found it e____.my cat likes to sleep on the w___. He found that it was important to learn English well.同义句转换He found ( ) ( ) to learn English well He found that it was important to learn English well.=He found ___ ___ to learn English well. When he returned to his country,he found it was war.(at on in with) he looked for his pen this morning and he found it 意思 He found it very interesting to rede a horse.为什么It 后无be动词 he found it important to master English其中it 和to master English做什么成分? he found it important to master English,中的《it》 和《to master Englishi》 是什么成分? he found it not easy to sleep为什么这里it后的be 动词省略了