注：以下只是大致的规律，不排除有例外。
1、以“-ate”结尾的多音节动词
- accelerate→accelerator
- administrate→administrator
- calculate→calculator
- educate→educator
- elevate→elevator
- generate→generator
- motivate→motivator
- narrate→narrator
- operate→operator
- refrigerate →refrigerator
- terminate→terminator
- translate→translator
- investigate→investigator
- escalate→escalator
注意，以“-ate”结尾的单音节动词多用“-er”后缀，如：