Somebody phone while you were in town . He was called Jack => Saturday is the day. I am free on Saturday => Hong is his girlfriend . Her father is going to go to go China next year => Nam is the most intelligent students . I have ever met him =>

2. Saturday is the day . I am free on Saturday.

=> Saturday is the day when I am free on .

( Vì the day là chỉ ngày . " when" là trạng ngữ chỉ thời gian nên ta dùng when thế cho Saturday. Luôn nhớ when luôn đứng sau các tiền ngữ chỉ thời gian như : day,month,time,year,....) 

3. Hong is his girlfriend . Her father is going to go to China next year.

=> Hong, whose father is going to go to China next year, is his girlfriend.

( N+ whose +N +V , whose dành cho tính từ sỡ hữu , mà "her" thuộc tính từ sở hữu )

4. NAm is the most intelligent student. I have ever met him .

Nam is the most intelligent student that I have ever met. 

( That dùng cho trường hợp "so sánh nhất" - The most intelligent : thông minh nhất . Như vậy the most là dấu hiệu nhận biết cho SS nhất. )