все вопросы к предложению «the detective was looking into the case from 8 a.m till 11 p.m yesterday»

Who was looking into the case from 8 till 11 pm yesterday? 

What the detective was doing from 8 am till 11pm yesterday? 

In what time the detective was looking into the case yesterday? 

When the detective was looking into the case? 

In what the detective was looking yesterday from 8am till 11pm?