Expand on is used for giving more detail, while expand into often describes growth into a new area or market. Other prepositions have more limited uses.
Use expand on to add more detail and expand into to describe growth into a new area, field, or market. Expand by is used with amounts or percentages. To and in are usually not direct complements after expand.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use on when developing an idea, explanation, or argument.
Use into for movement or growth into a different market, activity, or space.
Use by with numbers, percentages, or measurements.
In usually introduces the area where growth happens rather than a direct complement.
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 into for entering a new market or field.
✕ The company expanded on new markets. ✓ The company expanded into new markets.By shows the amount of increase.
✕ Profits expanded to 12 percent last year. ✓ Profits expanded by 12 percent last year.Use expand on when discussing ideas or explanations.
✕ Can you expand in that point? ✓ Can you expand on that point?Choose the expression that matches the intended meaning.
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It means to give more detail or explanation about a topic.
Yes. It is commonly used for entering new markets, industries, or regions.
Yes, but it usually refers to a final size or number, such as expand to fifty stores.
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