> This book is yours.
> That car is red.
一、基础结构例句
1. A cat sleeps on the sofa.
2. The dog barks every morning.
3. A bird chirps in the tree.
二、不同语境扩展
4. The teacher explains the lesson patiently.
5. A scientist conducts experiments every day.
6. The company launched a new product last month.
三、特殊主语示例
7. The sun rises at 6 AM.
8. The moon orbits the Earth.
9. A river flows through the valley.
这些例句展示了单数可数名词在一般现在时中作为主语时，谓语动词需加 -s 或 -es 的规则。