看看我英语作文的语法问题（小学六年级）
yesterday
Yesterday,I had a big surprise.there is a big park in Renmin Road,and we went there yesterday.There were lots and lots of people there.There were many beautiful flowers and trees there.The people was sang,danced and played chess there.We had a picnic in the park,the food was Chinese food,they were very delicious.Then we saw Chinese dancing in there.I really liked it.I want learn this dancing.
It's a very prefect day!