establish + object
Creating or setting up something
Establish commonly takes a direct object with no preposition.
establish a charity
establish clear rules
Establish in or establish by?
Establish is usually followed directly by an object. In and by are used in specific contexts, often as separate adjuncts rather than fixed verb combinations.
Quick answer
How to use establish with prepositions
Use establish something for creating or setting up: establish a company, establish a rule. Establish in can describe location or field after the object, as in establish a presence in Asia. Establish by usually introduces a method or deadline, as in establish the facts by testing the samples.
The firm established a branch in Singapore.
Scientists established the cause by comparing records.
She hopes to establish herself in the industry.
Scientists established the cause by comparing records.
She hopes to establish herself in the industry.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
establish + object + in + place/field
Showing where something is created or active
In introduces the place, market, or field connected to the established thing.
The brand established a strong reputation in Europe.
They established research centres in rural areas.
establish + object + by + method/time
Explaining how or when something is established
By introduces means, evidence, or deadlines rather than forming a fixed verb phrase.
The team established the timeline by analysing emails.
We must establish the policy by Friday.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
establish in
The company established offices in Brazil.
In refers to the location of the offices, not a fixed verb-preposition combination.
establish by
The researchers established the result by repeated testing.
By introduces the method used to prove or determine something.
establish oneself in
She established herself in academic publishing.
A standard expression meaning to become successful in a field or place.
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using establish in without an object
Establish normally needs an object unless used reflexively.
✕ The company established in Canada. ✓ The company established offices in Canada.Confusing by with a required preposition
By usually explains method or deadline, not a fixed pattern after establish.
✓ They established the facts by interviewing witnesses.Quick practice
Choose the expression that matches the intended meaning.
1. The organisation established a training centre ___ Nairobi.
2. Police established the timeline ___ reviewing security footage.
3. She worked hard to establish herself ___ the music industry.
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Frequently asked questions
Is establish in a fixed expression?
Usually no. In often introduces a place or field connected to the object of establish.
Can I say establish by?
Yes, when by introduces a method, evidence, or deadline: establish the facts by testing.
Do I always need an object after establish?
Usually yes. Common patterns include establish a business and establish oneself in a field.
Related preposition guides
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