Prepositions after determine

Determine: which preposition to use

Determine is commonly followed by by or from depending on meaning. Other prepositions usually belong to separate time or place phrases rather than to the verb itself.

Quick answer

Most common patterns with determine

Use determine by for method or criteria and determine from for source or evidence. Phrases with in or at are usually separate location or time details, not fixed combinations with determine.

Success is often determined by experience and timing.
The cause was determined from the laboratory results.
We determined at the meeting that changes were necessary.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
determine by + factor

Showing the basis for a decision or result

Use by to introduce the criteria, method, or factor that controls something.

Prices are determined by market demand.
The winner was determined by a public vote.
2
determine from + evidence

Identifying something from information

Use from when a conclusion comes from evidence, signs, or data.

Doctors can determine from the scan whether surgery is needed.
It is hard to determine from the photo how large the room is.
3
determine in + place/time

Adding location or time information

In often introduces a separate place or context phrase rather than a fixed verb pattern.

The issue was determined in court.
The final score was determined in the last minute.
4
determine at + event/place

Referring to where a decision happens

At usually introduces the location or event connected with determining something.

The policy was determined at the annual conference.
They determined at once that the plan was risky.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
determine by
The outcome was determined by weather conditions.
shows the controlling factor or method
determine from
Investigators determined from the footage that the door was unlocked.
shows the source of evidence or information
determine in
The dispute was determined in court.
in introduces place or context, not a fixed verb-preposition pair
determine at
The schedule was determined at yesterday's meeting.
at introduces an event, place, or time
determine for
The committee determined the budget for next year.
for normally belongs to the object phrase, not directly to determine

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using determine from for controlling factors

Use by when talking about what controls or decides something.

✕ Success is determined from hard work. ✓ Success is determined by hard work.

Treating in as a fixed partner

In usually adds place or context information.

✓ The case was determined in court.

Adding an unnecessary preposition

Determine often takes a direct object without a following preposition.

✕ We determined about the cause. ✓ We determined the cause.

Quick practice

Choose the expression that matches the intended meaning.

1. The final result was determined ___ customer feedback.
2. Scientists determined ___ the data that the drug was effective.
3. The policy was determined ___ the meeting yesterday.

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Frequently asked questions

Can I say determine by?

Yes. Determine by is standard when you mention the factor, method, or rule that decides something.

When do I use determine from?

Use determine from when a conclusion comes from evidence, data, or observation.

Is determine for correct?

Usually for belongs to another part of the sentence, such as determine the plan for next year, rather than forming a fixed pattern with determine.

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