據(jù)宣稱,一些早期文明中所創(chuàng)造出的技術(shù)只能從外星人那里學(xué)習(xí)了(錢伯斯)
It has been claimed that.這是一個主語從句,也就是說從句子的整體來說,that 后的成分都是整句話的主語,由于主語太長所以用it代替,it是一個形式主語,正常的語序應(yīng)該是the technologies shown by some early civilizations could only have been learned from people from another planet has been claimed
再來分析主語這一句話the technologies shown by some early civilizations could only have been learned from people from another planet
這句話中the technologies shown by some early civilizations 是主語,could only have been learned 是謂語,而該句沒有賓語,from people from another planet是這個句子的狀語
再來看the technologies shown by some early civilizations ,這是一個詞,technologies 是主干,shown by some early civilizations 是他的后置定語起修飾作用,
至于 could only have been learned,這是一個虛擬語氣的用法,因?yàn)檫@個句子所陳述的事實(shí)是猜測,所以需要用虛擬語氣,就是could+have/has done
我很認(rèn)真的在講解,你就采納了吧