Simple Verbs:
* Introduce
* Infect
* Invent
* Invest
* Inspect
* Insure
* Interact
* Include
* Impress
* Imagine
* Improve
More complex verbs:
* Investigate
* Illustrate
* Incorporate
* Identify
* Implement
* Inform
* Intensify
Remember: Regular verbs form their past tense and past participle by adding "-ed" or "-d".
For example:
* Introduce: introduced, introduced
* Invent: invented, invented
* Imagine: imagined, imagined
Let me know if you'd like more examples or want to explore other verb categories!