就近原则,根据靠近be动词的那个名词的单复数来决定be动词的形式.
there is a pen and two boooks .is --- a pen
there are two books and a pen .are -- two books
就近原则,根据靠近be动词的那个名词的单复数来决定be动词的形式.
there is a pen and two boooks .is --- a pen
there are two books and a pen .are -- two books