there is not +名词单数:There is not a book on the desk.there are not +名词复数:There are three books on the desk.注意:根据就近原则变换be的单复数形式:There are two books and a pen on the desk.There is a pen and two books on the desk.否定:there is no+名词单数:There is no reason.there are no+名词双数:There are no clouds in the sky.there is not+a/an +名词单数:There is not a letter for me.there are not +名词复数:There are not cats here.Is there a/an +名词单数:Is there a generation gap in your family?Is there not a/an +名词单数Are there not +名词复数动词:1.当表示主语一直存在的状态时,用doing :There is a girl crying in the corner.2.表示未发生的动作或即将进入的状态时,用不定式即to do There is the homework to do today.3.当表示主语的被动语态时,修饰主语,用过去分词:There is a nice meal cooken by me .
一般我们问外教问题都是excuse me 然后直接问问题的。不用说什么。如果是一些特殊得肯恩不愉快得问题。非要礼貌就说excuse me +do you have time /are you aavailable/few minutes。私人问题,就说i was wandering whether it is possible that i could ask you a personal question. 够礼貌了得。