Question

Put the verbs in brackets into the past perfect or the past perfect continuous . 13 .Mrs Edwards (make biscuits by the time her children came home. 14. Joh (try) to fix his computer for two hours before he decided to call a professional.
17.Liza was exhausted yesterday. She (study) for a history exam all day

Answer 1

13 .Mrs Edwards had made biscuits by the time her children came home.
14. Joh had been trying to fix his computer for two hours before he decided to call a professional. 
17.Liza was exhausted yesterday. She had been studying for a history exam all day