I have been to Taishang (Tai Mountain) last year (完成时). I took flight to Tai'an which is under the foot of Taishan. Then I traveled to Taishang on foot.( 过去时） It took me more than 3 hour to get the top of Taishan(过去时). I have stayed overnight in the top of Taishan. (完成时) and get up 2 o'clock in the next morning to watch the sunrise.