2. The food which was left in the party was eaten the following day
-> Which -> The food
3. His room which was filled with piles of old books was small
-> Which -> His room
5. These students who waited in the playground were late
-> Who -> These students
6. The girl who was waiting on you in the restaurant last night was becoming impatient
-> Who -> The girl
7. Jane who was wearing a hat waiting outside the room
-> Who -> Jane
Cấu trúc
-> Who -> Chỉ người (chủ ngữ)
-> Which -> Chỉ vật (tân ngữ/chủ ngữ)
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