If I drink coffee before going to bed, I can't sleep. / If I drink coffee before I go to bed, I can't sleep.

I used to go to work by foot before getting my driving license. / I used to go to work by foot before I got my driving license.

I didn't know how interesting the Louvre museum was before visiting Paris. / I didn't know how interesting the Louvre museum was before I visited Paris.

I always brush my teeth after eating breakfast. / I always brush my teeth after I eat my breakfast.

She often enjoys a nice cup of tea before going to bed. / She often enjoys a nice cup of tea before she goes to bed.

I was sweating a lot after running to class. / I was sweating a lot after I run to class.

I discovered how nice korean are after travelling to Seoul. / I discovered how nice korean are after I travelled to Seoul.

I slept all day yesterday after playing games all night. / I slept all day yesterday after I played games all night.

I'll go to bed after watching a movie. / I'll go to bed after I'll watch a movie.

I was unhappy before meeting you. Now I'm feeling great! / I was unhappy before I meet you. Now I'm feeling great!

My body always feels great after exercising. / My body always feels great after I exercise.

I never drink too much water before sleeping. / I never drink too much water before I sleep.

You should always stretch before-after exercising. / You should always stretch before-after we exercise