controlled by + agent
Who causes or directs something
In passive sentences, by introduces the person or thing exercising control.
The region is controlled by the army.
Control: which preposition to use
Control is usually followed by by in passive structures and over when talking about power or authority. Other prepositions may appear as separate time, place, or manner phrases.
Quick answer
Common uses of control
Use controlled by to name the agent in a passive sentence and control over to describe power or authority. Combinations such as control for have special technical meanings. Control in, control from, and control with are usually separate adjunct phrases rather than fixed verb-preposition combinations.
The company is controlled by a private investor.
She has control over the budget.
Researchers controlled for age and income.
She has control over the budget.
Researchers controlled for age and income.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
control over + thing
Power or authority over something
Over is the standard preposition for authority, influence, or management.
Parents need control over spending habits.
control for + variable
Adjust for a factor in research
In statistics and research, control for means to remove the effect of a variable.
The study controlled for prior experience.
control with + tool
Means used to control something
With introduces an instrument or method, not a fixed verb-preposition pair.
They controlled the machine with a remote device.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
controlled by
The network is controlled by one company.
Standard passive pattern showing the controller.
control for
Scientists controlled for temperature changes.
Standard technical use in research and analysis.
control in
She worked calmly in difficult conditions.
In usually introduces a separate place or situation phrase, not a fixed combination with control.
control from
He controlled the drone from his laptop.
From normally shows location or source, not a selected preposition after control.
control with
They controlled the lights with an app.
With introduces the tool or method used.
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Using in instead of over for authority
Use over to express power or authority.
✕ She has control in the department. ✓ She has control over the department.Confusing by and with
By names the controller in passive sentences; with names an instrument.
✕ The system was controlled with the operator. ✓ The system was controlled by the operator.Using control for in everyday authority meanings
Control for is mainly technical and statistical.
✕ The manager controls for the team. ✓ The manager controls the team.Forgetting the object after control over
Over is normally followed by the thing being managed.
✕ He has control over. ✓ He has control over the process.Quick practice
Choose the expression that matches the intended meaning.
1. The country was controlled ___ a military group.
2. Researchers controlled ___ income level in the analysis.
3. She has complete control ___ the project budget.
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Frequently asked questions
Is control by correct?
Yes. Controlled by is common in passive sentences: The company is controlled by investors.
Can I say control in?
Usually in introduces a separate place or situation phrase, not a fixed combination after control.
What does control for mean?
It means to account for a variable in research or analysis so its effect is reduced or isolated.
Related preposition guides
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