There is a pen,a knife and several books on the desk.中on the

There is a pen,a knife and several books on the desk.中on the there are a pen,a knife and several books on the desk.哪错了? there are pen ,a knife and several books on the desk.哪错了? there is a pen and two books on the desk.还是there are a pen a there is a pen and tow books on the desk.对 a pen and tow boo There 什么a pen and two books on the desk is there a pen and some books on the desk?肯定回答是yes,there is There is (are) a pen and some books on the desk 此句中,为什么既可the There is (are) a pen and some books on the desk .是倒装句吗? there is a pen on the desk? on ,are ,and,there,books,there,a,pen,the,desk连词成句 There is a knife on the desk.改复数句