both和all做不定代词的时候,说位置是,一般动词前,定冠词,所有格,数次形容词之前.------对的.
I've read both these papers.
read是属于一般动词吧,但这里both修饰的是papers.因此要放在这里.如同：both the boys.
在BE动词或者助动词之后-----指BOTH作主语同位语时.
eg.They both like apples.
They are both students.