Help read these sentences and open the brackets using the past simple or the past continuous. write only the verb forms. 1. sam (pat) the dog when it (bite) him.2. when i (type) my report, mark (leave) the office.3. peter (read) while i (have) lunch.

1. Sam patted the dog when it bit him.
To form the past simple tense, we add -ed to the base form of the verb (pat). "Bite" is already in the past simple form.
- "Sam patted the dog" - past simple (pat)
- "when it bit him" - past simple (bite)

2. When I typed my report, Mark left the office.
Again, to form the past simple tense, we add -ed to the base form of the verb (type). "Leave" is already in the past simple form.
- "When I typed my report" - past simple (type)
- "Mark left the office" - past simple (leave)

3. Peter was reading while I was having lunch.
To form the past continuous tense, we use the past tense of "to be" (was/were) and add the present participle form of the main verb (read/have).
- "Peter was reading" - past continuous (read)
- "while I was having lunch" - past continuous (have)