1. The last time I saw my best friend was at a festival. She was home from Australia.
- "The last time"-> chỉ thời gian
-> The last time I saw my best friend was at a festival when she was home from Australia.

2. My favourite dessert is pavlova. My mother makes it for my birthday every year.
- "Palova"-> chỉ đồ vật, đồ ăn
-> My favourite dessert is pavlova, which my mother makes for my birthday every year.

3. Have you watched that film yet? I recommended it to you last month.
- "The film"-> chỉ vật
-> Have you watched that film which I recommended to you yet?

4. I've never met that woman. My cousin is talking to her.
- "Women"-> Chỉ người 
-> I've never met that woman whom my cousin is talking to her.

5. I want to buy that handbag. It has grey buttons.
- "Gray button"-> chỉ vật
-> I want to buy that handbag which it has grey buttons.

6. I'll never forget that moment. I met the president of Ireland.
- "Moment"-> chỉ thời gian
-> I'll never forget that moment when I met the president of Ireland

7. This is the playground. We used to play there every day as children.
- "Playground"-> chỉ nơi chốn
-> This is the playground where we used to play there every day as children.

8. That's the window. It was broken last week.
- "The windows"-> chỉ vật
-> That's the window which was broken last week.

* P/S: Mod thấy thiếu thì tự làm đi, em đã có tâm làm cho bạn ấy rồi,mod đã không làm rồi thì chớ, còn bắt em giải thích thêm >:<

$\textit{1. The last time I saw my best friend was at a festival when she was home from Australia.}$

$\textit{2. My favourite dessert is pavlova, which my mother makes for my birthday every year.}$

$\textit{3. Have you watched that film which I recommended to you yet?}$

$\textit{4. I've never met that woman whom my cousin is talking to her.}$

$\textit{5. I want to buy that handbag which it has grey buttons.}$

$\textit{6. I'll never forget that moment when I met the president of Ireland.}$

$\textit{7. This is the playground where we used to play there every day as children.}$

$\textit{8. That's the window which was broken last week.}$