上上个周六可以用“the saturday before last saturday”来表示吗?还有没有更好的表示方法?

I worked overtime late into the night last Saturday.

- -这不科学 我也在写

our trip to xichong bearch
last saturday,our whole class had a great time out.we went to xichong beach which is an ideal place for a weekend getaway.we stady hard at other times,so we do deserve a rest and relax once in a while.so we had been looking forward to this trip very much.and it turned out that this trip in no way let us down.
we got to the beach at nine in the morning when the sun just rose,and it felt so warm and good basked in the sun.we swam and played water in the sea,we sunbathed on the beach when we got a bit tired from swimming and playing.
we has barbecue at noon.for some of us it was the first time to have an outdoor barbecue,which we enjoyed so much.it is more fun than an indoor one,especially when it was on a beach where you were greeted by the blue skies,open sea and white beach sand.we also played beach volleyball,which gave us a taste of this Olympic event.
we really play hard that day,and we enjoyed it,because when we work,we work hard.work hard and play hard,so we can enjoy life.

the 11th of June Wednesday Sunny
Last Saturday,I went to Huayang Moutain with my classmates.We went there by bike.We sang all the way.We were all very happy.The view of this moutain is beautiful.The flowers are colourful and the trees are green.They relaxed me.We climed the moutain for about an hour.Suddenly,we found that Kangkang missed.We were so worried.At last,we found him rowing in the lake.
This is really an unforgettable and interesting experience.I'll never forget it.
水平有限呢,你参考吧.