Краткое пояснение: Составляем вопросы в Past Continuous, начиная с Was/Were + подлежащее + глагол с окончанием -ing.
- Were you studying (study) English at 8 p.m. yesterday?
- What were they doing (do) when the fire alarm rang?
- Was she talking (talk) to someone when you arrived?
- Why was he laughing (laugh) so loudly?
- Were we walking (walk) home when it started to rain?
- Was your brother watching (watch) TV when you called him?
- Where were they going (go) when you saw them?
- Was she dancing (dance) when the music stopped?
- Was the teacher explaining (explain) something when the bell rang?
- What were you wearing (wear) at the party last night?
Ответ: смотри решение выше