Formal and informal relative adverbs 1

1. Do you know the reason for which she is so tired? = Do you know the reason she is so tired?✓

2. This is the apartment building in which we lived for three years. = This is the apartment building we lived for three years.✓

3. This is the beach at which I used to swim. = This is the beach I used to swim.✓

4. December is the month in which people spend a lot of money shopping. = December is the month people spend a lot of money shopping.✓

5. I remember the day on which we met. = I remember the day we met.✓

6. She didn't tell him the reason for which she was leaving. = She didn't tell him she was leaving.✓

7. The summer in which we got married was a hot one. = The summer we got married was a hot one.✓

8. The reason for which he stopped calling is still unclear. = The reason he stopped calling is still unclear.✓

9. The room in which Robert sleeps is pretty small. = The room Robert sleeps is pretty small.✓

10. This is the park in which we used to hang out. = This is the park we used to hang out.✓