They are all 17.还是They all are 17.

1.all作为代词“全部、全体”并做主语
时,在句首,如：All of us are
students.
2all作为代词“全部、全体”并做同位
语时,在被同位的名词或代词之
后,如：They all went to the park
yesterday.We are all students.
3.all作为前位限定词“全部的、所有
的”做定语时,在其所处的意群的做
前面,如：All the students are
fond of English.
4.all作为副词“完全地”做状语时,在
其所修饰的词的前面,如：all
about them、all round the world
all放在be动词后

They are all 17
望采纳

They are all 17

all放在助动词后实意动词前，Be动词可看做助动词所以all放在are后！

前面的