Помогите первые 3 предложения сделать (Transform the sentences introbPast Continuous and Future Continuous tenses.Add the necessary adverb)

1. Mike was reading an interesting book when John came. Mike will be reading an interesting book tomorrow after dinner. 2. Mary was writing a letter to her friens at 2 o`clock yesterday. Mary will be writing a letter to her friens tomorrow evening. 3. They were speaking to their teacher when the bell rang. They will be speking to their teacher in twenty minutes.