下面两个句子有什么区别?It is four years since I knew Candy.It has been four years since I knew Candy这两个句子有什么区别?

下面两个句子有什么区别?It is four years since I knew Candy.It has been four years since I knew Candy这两个句子有什么区别? 下面两个有什么区别 it is over.和it was over.的区别.究竟哪个结束了?还有这两个句子在语法上有什么区别,意思相差多远. 天变的越来越热了,it is getting hot,还是it is getting hotter?这两个句子正确吗?有什么区别吗? closing与 closed用法区别下面句子的最后一个词应该什么啊,用法有什么不同呢?It is cold tody.please keep the door ... 请区分下面两个英文句子what's your friend look likewhat does your friend look like用is和用does用起来有什么区别 is 和is it 有什么区别 It is said和It said如上,这两个词组有什么区别? 下面两个英语句子的区别1.People say that the world is getting smaller.2.It is said that the world is getting smaller. what is the matter?和 it is does dot matter.两个matter有什么区别急 这两个英文句子有什么区别呢?That milkman is old.That is old milkman. which one is she?which one she is?这两个句子有什么区别? 船舶主机用重油 HFO 和 FO 有什么区别、 it is ashamed/shameful 两种用法都可以嘛?有什么区别?it is 句型，两个都有 是不是？ Learning English well is not easy和It is not easy to learn english well.这两个句子有什么区别?Learning English well is not easyIt is not easy to learn english well.这两个句子有什么区别?是不是有什么句式来着 closing与 closed用法区别下面的句子的最后一个词该用哪个词啊It is cold tody.please keep the door,它们有用法上区体有什么区别呢? Isn't it 和 is it区别有什么区别 here they are .here you are.here it is .三个句子有什么区别?