句子单数变复数，注意以下五要素
(1)主格人称代词要变成相应的复数主格人称代词,即I→we, you→you，she,he,it→ they。
如：She is a girl. →They are girls.
(2)am，is要变为are。如：
I’m a student. →We are students.
(3)不定冠词a，an要去掉。如：
He is a boy. →They are boys.
(4)普通单数名词要变为复数形式。如：
It is an apple. →They are apples.
(5)指示代词this，that要变为these，those。如：
This is a box. →These are boxes.
练一练：
一 按要求写出所给单词的复数形式.
1.snowman _____ 2. leaf _____ 3. family _____ 4. city _____ 5. dish ______
6. child _____ 7. man ______ 8. woman ______ 9. dress ______ 10 potato
11.piano 12. toy 13. Englishman 14.Chinese
15. wife 16. wolf 17. fox 18 peach 19 name
二 把下列句子改为复数句子形式
1.This is a nice flower.________ ________ nice _________.
2. This is a girl.___ _______ ___________girls.
3. This is a backpack.__ ______ _______ backpacks. __________ __________ ___
4. This is Tony's ruler.___ ______ _________Tony's _ ______ .
5. This is my parent. __ ______ _________ my _ _____ _ __.
6. This is a bedroom.
7. The flower is red._________ _________ _________ __________
8. Here is your book. Here ______ ______ _______.
9. He / She is a teacher.
10. She is a woman doctor. They ________ ________ doctors.
11.What is this? What _____ ___ _?
12.It is an eraser.
13. She is my uncle's daughter._______ _______ my uncle's ________
14. I am a student.
15. He's a Chinese boy.
这就是为大家分享的小升初英语句子单数变复数知识点，希望能够切实的帮助到大家，并祝大家能够在考试中取得优异的成绩！