一味地使用長句或短句會使文章顯得單調，乏味，從而影響文章的總體效果。科學地交替使用長短句使句子結構變化多樣，不僅給文章帶來頓挫起伏的語言美感，而且可以受到理想的修辭效果。
三年級優秀英語作文大全范文一：
冬天
Winters in Taipei are very cold during the evening and very windy during the daytime. I usually look forward to the Lunar New Year's Day and the winter vacation when I can go to the village where the climate is warmer during these holidays.
Also, I look forward to seeing my grandmother, great-grandmother, and my friends in the village; I like my grandmother's food very much. Winter is the time everyone is in a festive mood.
In the city, I usually do a lot of reading at home in the winter because of the cold weather outside.
三年級優秀英語作文大全范文二：
武漢的秋天
Autumn is the nicest season of the year in Wuhan.The weather in the autumn is very pleasant.
The heat of the summer has gone back.The days are dry,a soft,gentle wind is blowing.School begins again,and we can meet our friends and study together.
The winter freeze has not arrived.No snow!no cold!indeed,everyone in this city enjoys autumn the most.
三年級優秀英語作文大全范文三：
my pet cat
I have a very beautiful cat.Its colour is white or yellow .its name isHaahua .Ithink it is my favourite cat .she likes sleep playing with the bell .she love ratting meat ,Though it is a kind of animals ,I treat it as my friend .sometime I give her some fish or pork to eat .When she sees the fool she begin to cry miao miao .As if she is very hungry and thirsty .Wherever I amwalk she follws me .
How happy I am !How nice my friend is !I love her more and more .
三年級優秀英語作文大全范文四：
My Pet
Recently, three owls appeared suddenly on our campus. They made me think of my pet from childhood. When I was little, we had an owl at home. It was small, gray, and had two big eyes.
We liked it very much. Every time I went home, it greeted me by making “goo-goo” sounds. We always played with it and talked to it. It would blink its eyes just like it understood what we were saying.
It was like my best friend. But when the weather became colder, we forgot to keep it warm, and it died. It made us sad for a long time, and it also taught me how important it is to take care of animals.