I have many friends,who all or all of whom are students
which is correct "I have many friends,who all are University students" or "I have many friends,all of whom are University students"?
Solution 1:
Both are acceptable, but the second is much more frequently used. I enter ", who all" into COCA https://www.english-corpora.org/coca/, and it returns 248 results. 1536 example sentences with ", all of whom" are found in the corpus.