帮我看下这篇英语文章有什么语法方面的错误或者有什么需要更改
Last winter holiday.I went to Beijing by plane.I’m so excited when I got to Beijing.
At that time ,Beijing was very cold.I wore 5 clothes together .But I felt cold also.
Beijing is a busy city .I could saw cars and people everywhere .
First day,I went to see the Tian’ an men .There were many people over there.How big was there There were many plants over there .What a beautiful place And made me surprised ,there were many red flags over there.
Second day,I went to the Palace Museum .There was very big and beautiful.
Beijing was so beautiful .I want to watch it again.