教你格式吧
首先,标题用的是was 所以,整片文章应该是过去时态.
How was your Winter Holiday
I have had a good holiday.During the winter holiday,I did so many things,such as doing my homework,visiting my grandparents.(根据自己的情况可适当添加)(然后具体写一项活动)I make a sownman with my sister……（最后来总结的话）I learned much in my holiday,it's important to me.