Expound commonly combines with on or upon when explaining a subject in detail. Expound by is not a standard verb-preposition combination.
Use expound on or the more formal expound upon to mean explain in detail. By may appear in a separate phrase about method, but not as the normal complement after expound.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
On is the standard preposition after expound.
Upon has the same meaning as on but sounds more formal.
By can introduce method, but it does not directly complete the verb expound.
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.
Expound normally takes on or upon before the topic.
✕ She expounded by the theory. ✓ She expounded on the theory.Expound is usually followed by on or upon.
✕ He expounded the issue for an hour. ✓ He expounded on the issue for an hour.By can describe method after the main structure.
✕ They expounded by climate change. ✓ They expounded on climate change.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
Yes. Expound on is the standard expression meaning explain in detail.
Not as a direct verb-preposition combination. By can introduce method after expound on.
They mean the same thing, but upon is more formal.
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