22. The taxi driver who took me to the airport is friendly.

- "The taxi driver" thay thế cho từ "he" ở vế thứ hai -> ĐTQH là "who".

23.  I ran into a woman whom I had gone to elementary school with.

24. The house where I used to live is empty now.

- Used to V - inf: Đã từng làm gì ở quá khứ.

- N người + whom + S + V.

- N người + who + V.

- N nơi chốn + where + S + V.

N (người) + who + V 

N (người) + (giới từ) + whom + S + V 

N (nơi chốn) + where + S + V 

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22. The taxi driver who took me to the airport is friendly.

23. I ran into a woman with whom I had gone to elementary school.

24. The house where I used to live is empty now.

`color{orange}{~MiaMB~}`