frank can play the guitar well,but he couldn't play the piano.he's good at play both basketball and valleyball,but couldn't play pingpong at all.he can skate but can not sky.
during this summer vaction I went to my grandparent's house to visit them,and I helped them with housework.I read many books,such as ### ### ###.（自己加吧= =）I also surfed on the internet and read news.I went out to play with my friends and we enjoyed the summer sunshine.of coures,I did my homework carefully.in a word,I had an interesting summer vacation.