Causing an action
Use to before the action that follows from the cause.
The most common patterns are prompt someone to do something and be prompted by something. Other prepositions usually add separate information.
Use prompt to before an action and prompted by before a cause or reason. Prompt for, prompt on, and prompt with are limited or context-dependent.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use to before the action that follows from the cause.
By introduces the thing that caused the action or reaction.
With introduces information or assistance given to someone.
In technical and computing contexts, prompt for means ask for information.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Use to before a verb after prompt someone.
✕ The message prompted me for call her. ✓ The message prompted me to call her.By introduces the cause; to introduces the resulting action.
✕ He was prompted to fear. ✓ He was prompted by fear.On usually introduces a topic, not the core pattern.
✕ The news prompted on resign. ✓ The news prompted him to resign.With introduces help or information, not the resulting action.
✕ The film prompted viewers with think differently. ✓ The film prompted viewers to think differently.Choose the expression that matches the intended meaning.
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Prompt someone to do something is the main structure for causing an action.
Use prompted by to explain the cause or motivation behind an action or decision.
Yes, especially in computing and forms, where it means request information.
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