Perceive as is the standard pattern for describing how someone interprets something. Perceive by is not normally used for interpretation, but by may appear separately to describe means or agency.
Use perceive as when you describe how something is viewed or interpreted. Do not normally use perceive by with this meaning. By can appear in the sentence as an adjunct of method or agent.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use as to show the role, quality, or identity assigned to something.
Perceive can take a direct object when referring to awareness through the senses or mind.
By does not normally follow perceive as a selected preposition. It can introduce the method used for perception.
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 perceive as when giving an interpretation or judgement.
✕ The public perceived him by dishonest. ✓ The public perceived him as dishonest.As is not needed when perceive simply means notice.
✕ I perceived as a strange smell. ✓ I perceived a strange smell.By usually introduces method, not a complement after perceive.
✕ She perceived the plan by impossible. ✓ She perceived the plan as impossible.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
It is common in both formal and neutral English when discussing opinions or interpretations.
Not usually. For passive meaning, use perceived by people only when by introduces the agent: The painting was perceived by critics as innovative.
Both can express judgement, but perceive often suggests awareness or interpretation, while regard is more directly about opinion.
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