an hour ago 算不算段时间

an hour ago 算不算段时间 We talked___half an hour ago an hour ago和an hour later有什么区别? since 还是 for an hour ago half an hour ago 什么意思? tom ____(play)football an hour ago when ()it ()?(arrive) half an hour ago They left Changsha an hour ago. They left an hour ago变成现在完成时 改写He returned home an hour ago Sam ( )here half an hour ago It started to rain an hour ago