ASK STS TO ADDWHO , WHOEVER ,WHOM , WHOSE , WHICHKEYS
3.Which: chỉ vật có thể làm chủ ngữ hoặc tân ngữ.
Vd: Her hat is yellow. It is on the table.
Her hat which is on the table is yellow.
Vd: Her hat is yellow. I see it on the table.
Her hat which I see on the table is yellow.