1. 一般现在时态的非第三人称单数中用动词原形：
We often get up early.
They like swimming in the river.
2. 与助动词或情态动词一起构成谓语时，要用原形：
Does your sister like English？
Can I use your telephone？
3. 祈使句的谓语动词，要用原形：
Close the door behind you, please.
Tom, close the door.
4. 情态动词 + 动词原形：
I can dance.
I want to be a teacher.
5. 带to的动词不定式 + 动词原形：
She doesn't like playing football.
6. 强调句中动词原形：
I do my work.
7. 感官动词后作宾补的动词用原形：
I saw the train come into the station.
I heard a letter drop.
8. 使役动词let, make后的宾语与作宾语补足语的动词构成逻辑上的主谓关系时，这个动词要用原形：
He let Jack lead the way.
Have him send the letter.
9. 在why not…和why…句型中，not和why后直接跟动词原形：
Why not use my bicycle？
Why waste so much money？
10. 动词help后是复合宾语，其宾语补足语由动词充当时，这个动词前带to或不带to都可，但在被动语态中必须带to：
She helped me clean the room.
11. do, does, did与动词原形连用，以加强语气：
Do be careful!
She does look nice today.
I did think he was wrong.
12. 不定式作介词but和except的宾语，当其前有实意动词do时，后面的动词不定式要省略to：
Jack had nothing to do but watch TV.
13. 在一些固定的句型中，如had better（最好），would rather（宁愿），would rather…than…（宁愿…而不）等后面的动词要用原形：
You had better have a good rest.
He would rather go to work by bike.
这些例句展示了动词原形在不同句型中的用法，包括一般现在时、祈使句、情态动词搭配、感官动词、使役动词和固定句型等。希望这些例子能帮助你更好地理解和学习动词原形的用法。
