hi my friends how are u !
today i'll explain for you the lesson of english
these link words express time
now what is the rule ?

before + past simple+ past perfect
- past perfect + before + past sipmle

after/when/as soon as + past perfect + past simple
-past simple + after/when/as soon as + past perfect

past simple + until + past perfect

past simple is for the second action
past perfect for the first action

thank you for ur attention my friends

:raai3: