Question

when can simple past and past perfect continoues be used ?​

Answer 1

Explanation:

We use the past perfect simple to refer to the completion of an activity and the past perfect continuous to focus on the activity and duration of the activity. I'd waited an hour for the bus. Past perfect simple emphasises the completion of the activity (the waiting is over)

Answer 2

Answer:

We use the past perfect simple to refer to the completion of an activity and the past perfect continuous to focus on the activity and duration of the activity. I'd waited an hour for the bus. Past perfect simple emphasises the completion of the activity .