问题:
For convenience it is common to speak of plants as "herbs," "shrubs," and "trees," but it is really no sharp distinctions among them.____
疑惑如下:it is改为there are,说it不作句中任何成分也不是形式主语(为什么呢?我认为to......trees是它的主语呀)还有为什么改成there are,不是there is 呢?真诚请教,求回答谢谢老师!
你在学校应该学过there be存在句吧。例如桌子上有一本书,There is a book on the desk. 在这个句子中there是个虚指代词,作形式主语。be是不及物动词,意为存在。其后的名词是真正主语。be的数是由真正主语的数决定的。如果桌子上有二本书,就要用There are two books. 你提问的改错的句子就是一个存在句,主语为复数名词distinctions, 所以要用there are。
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