Consider this sentence:
M couples leave a party... What is the number of men before couples leave
What is the proper word for the bold part:
- Before couples leave
- Before leaving of couples
- Before that couples leave
- Before leaving by couples
I know after "Before" and "After" usually a gerund comes, but I can't guess how can I write the sentence to include a gerund. Anyways, which case is correct or incorrect and why. Should I always repeat the previous sentence "They leave"? What if it was a long sentence?