Open the brackets, using the correct tense form. explain the use of the tenses. "for the simple reason that i (see) the dog at our door and i (hear) the bell which its master (ring). i wonder why dr mortimer (want) to see mr sherlock holmes. well, we soon (know). come in," he (add), there (be) a knock at the door.

"For the simple reason that I (saw) the dog at our door and I (heard) the bell which its master (was ringing). I wonder why Dr Mortimer (wanted) to see Mr Sherlock Holmes. Well, we shall soon (know). Come in," he (added), there (was) a knock at the door.

Saw-heard-was ringing-wanted-know-added-was
saw,heard,wanted,added,was-Past Simple -констатация факта в
Know-Present simple по согласованию времен
was ringing-past continuous-действие в процессе