请问,It is essential to know what you can talk about with different people.

请问,It is essential to know what you can talk about with different people. It is essential taht the human doesn't make a mistake .这句话是主语从句吗? 中学英语学习中的一个小小语法点,不大懂,例句：I think it essential to reserve air tickets这一类句子中都用 it 作形式宾语请问：为什么这个例句不能改为“I think it is essential ... 感觉读来也挺顺啊. 有It is essential for sb to do吗 Farming,_____to human welfare,is now a small part of the economy of the country.A.essential as it is B.essential as is C.it is essential D.as essential 16.To drive a car safely it is good brakes.16.To drive a car safely it is () good brakes.A.essential to haveB.essential withC.essential havingD.essential have the opening ceremony is a great occasion.it is essential _______for that.A for us to be prepared B that we are prepared...可是我觉得应该是 for us to prepare答案说如果是B的话 应该原句是 it is essential that we should prepare for t The essential features of something are those features that make it the thing that it is. I think it essential that...为什么不用 I think it is.. and lacking something that which essential 请问这里面的that 全句式这样的！An idea is not perfect！it is but a partial image，and lacking that something which is essential seldom come ture！刚才提问错了，that 应该在something It is absolutely essential that 怎么看出是虚拟语气啊 副词后面可以接形容词吗?It is therefore essential for . It is essential that you ____on time.A.be B.are C .were D.being It is essential that everyone ___ what to do.A.knowB.knows为什么不是B呢? 64.你务必参加这个会议.（It is essential that…） AT shcool,it is essential that every child--equally regardless of family backgroundAtreatingBtreatedCbe treated Dis treated { }（ is .it ）a boat?NO,it { }(is.isn,t )a ship.请问应该怎样填. It is only with the heart that one can see rightly； what is essential is invisible to the eye.