五年级英语复数句子的构成规则及示例如下：
一、规则变化
一般情况：
直接加-s
- 单数：book → 复数：books
- 单数：cat → 复数：cats
- 单数：pen → 复数：pens
以s, x, ch, sh结尾：
加-es
- 单数：box → 复数：boxes
- 单数：watch → 复数：watches
- 单数：brush → 复数：brushes
以辅音字母+y结尾：
变y为i再加-es
- 单数：city → 复数：cities
- 单数：baby → 复数：babies
- 单数：foot → 复数：feet
以f或fe结尾：
变f或fe为v再加-es
- 单数：knife → 复数：knives
- 单数：leaf → 复数：leaves
以o结尾（有生命）：
加-es
- 单数：tomato → 复数：tomatoes
- 单数：potato → 复数：potatoes
- 单数：hero → 复数：heroes
二、不规则变化
man → men
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
child → children
goose → geese
foot → feet
tooth → teeth
mouse → mice
