1. We enjoyed the party **that** Peter and Pam had to celebrate Christmas.  
   (The word "that" is used to connect the clause describing the party.)

2. Is this pub **where** you meet your friends?  
   (The word "where" is used to refer to the location where the meeting takes place.)

Trả lời:

• We enjoyed the party which Peter and Pam had to celebrate Christmas.
• Is this the pub where you meet your friends?

Giải thích:

• which: dùng để thay thế cho danh từ chỉ vật (the party)
• where: dùng để chỉ nơi chốn (the pub)