Policeman:Do you have any idea who the thief might be?
Jessie:Yes,I do. A strange man was hanging around outside last week.
Policeman:Anything else?
Jessie:Yes,he was carrying a very old briefcase.And he was taking pictures of the things in my store.
想請問知識大大們,為什麼上述那些句子Jessie所回答使用都是用過去進行式呢?例如:was hanging、 was carrying、was taking,謝謝:)