WHEN AND WHILE

WHEN (CUANDO)

Structure:

• When + subject + verb past simple + complement, subject + verb past continuous + complement.
  
• Subject + verb past continuous + complement + when + subject + verb past simple + complement.
  

Examples:
I was having a shower when the telephone rang.
When the telephone rang, I was having a shower.

WHILE (MIENTRAS QUE)

Structure:

• While + subject + verb past continuous + complement, subject + verb past simple + complement.
• Subject + verb past simple + complement + while + subject +verb past continuous + complement.

Examples:

I phoned you while my dad was cooking.

While my dad was cooking, I phoned you.

* La interrogativa se hace siempre con la forma verbal de la oración principal.