There be句型中be动词的单复数形式由后面挨近的一项的单复数决定. 如:There is a pen,two books and many pencils on the desk.在本高困句中尽管有钢笔、书和铅笔,但是由数念悔于离be动薯正词最近的一项是单数a pen,因此,be动词用单数is.又如:有一本书和三只猫.there is a book and three cats.反过来,有三只猫和一本书.there are three cats and a book.