Past simple
What food you like (like) eating as a child?
What food did you like eating as a child?
What you (do) yesterday at 6.30 p.m.?
What were you doing yesterday at 6.30 p.m.?
Who (be) your best friend at school?
Who was your best friend at school?
What you (do) when your teacher (start) the lesson?
What were you doing when your teacher started the lesson?
Where you (study) English before you (come) to GF?
Where had you studied English before you came to GF?
When (be) the last time you (feel) blue?
When was the last time you felt blue?
you (meet) any of your GF groupmates before you (start) this course?
Had you met any of your GF groupmates before you (start) this course?
What you (do) before this lesson started?
What had you done before this lesson started?