Inform is commonly followed by of or about when giving information. Inform by is not a standard active pattern.
Use inform someone of something or inform someone about something. Of is often more formal and concise. Do not use inform by as an active pattern, although informed by is correct in passive or adjectival uses.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Of is common in formal notices, official communication, and concise statements.
About is common in everyday English when talking about a subject in detail.
Informed by is a separate passive or adjectival pattern meaning influenced or guided by.
Inform can also take a direct object when the information itself is understood from context.
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.
Inform does not normally take by after the verb in active use.
✕ They informed by customers about the delay. ✓ They informed customers about the delay.Inform usually needs a person or group receiving the information.
✕ She informed about the accident. ✓ She informed us about the accident.Informed by means influenced or guided by, not told about.
✕ I was informed by the schedule change. ✓ I was informed about the schedule change.Choose the expression that matches the intended meaning.
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Inform of is often more formal and concise, while inform about is common in everyday explanations.
Yes. Informed by means influenced, guided, or shaped by something.
It exists in some professional contexts, especially in American English, but inform someone about is more widely neutral.
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