句子的長短是為表達思想服務的。英語短句結構簡單，意思明白具有生動活潑而又干脆利索的表達效果，而長句結構復雜，信息豐富，能表達成熟的思想與復雜的概念。
三年級優秀英語作文大全范文一：
My favourite animal
I like animals very much, such as horses,monkeys, cats, tigers and so on. But I like dogs best. Why? Because they are very cute and nice.
I have a white dog. Its name is Bobo. She is a female dog.She comes from Beijing,China.She wears white clothes and she has two big eyes and a small month.She often walks round and round at home.It has nothing to do.She likes eating ice-cream so much.So do I.When I eat ice-cream,she will look at the ice-cream carefully,So I will give her some to eat.
I think Bobo is the cutest dog in the world.
三年級優秀英語作文大全范文二：
The bird and cat
once upon a time. there was a house. beside the house there was a bird cage. one day a cat went to eat the bird, so the cat jumped and hit the bird cage.
the bird cage fell down to the ground knocking the bird cage's door open. the bird then flew away. so the cat started to chase the bird and the dog chased the cat. however the bird flew on top of the tree. so the cat started to climb the tree and the dog barked at the cat. before the cat could reach the bird, the bird flew away. this caused the cat to fall out of the tree.
the dog then ran away, the bird quickly flew back into his cage and the man from the house carried him safely home.
三年級優秀英語作文大全范文三：
Four Seasons
there are four seasons in a year. they are spring, summer, fall and winter.spring is warm and sunny. the trees are green and flowers are beautiful. we can plant trees and run on the grass.
summer is my favorite season. the weather is very hot, sometimes it rains. i like to swim in the swimming pool. and i can wear my beautiful dress. and i can eat ice creams.fall is a beautiful season. the weather is very cool. we can eat a lot of fruits. and the leaves are colorful.
winter is very cold. but in nanhai it does not snow. we can not play with snow.
i like the four seasons very much.
三年級優秀英語作文大全范文四：
My Cousin Stella
i have many cousins. i like stella best. she is a pretty girl. she likes eating cucumbers , eggplants, cabbages… she doesn’t like eating eggs and milk. so she is very short.
stella is an excellent student . she is the monitor of her class. she likes studying and she studies very hard. so she is always the top student in her class.in this summer holiday , i spent a very happy time with her in sichuan . i often miss her very much.
i like my cousin best!