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Prepositions after verbs

Intervene in, on, with, at or by

Intervene is usually followed by in when someone becomes involved in a situation. Other prepositions have more limited or separate uses.

Quick answer

Which preposition follows intervene?

Use intervene in for becoming involved in a situation, conflict, or process. Intervene on often appears in the phrase intervene on behalf of someone. With, at, and by are usually separate adjuncts rather than standard verb patterns.

The government refused to intervene in the dispute.
Lawyers intervened on behalf of the tenant.
She intervened with a practical suggestion.

Choose the pattern by meaning

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

1
intervene in + situation

Becoming involved in an event or conflict

In is the standard preposition after intervene.

The UN may intervene in the negotiations.
Teachers should intervene in bullying cases quickly.
2
intervene on behalf of + person

Acting to help someone

On is commonly used in the expression on behalf of.

A neighbour intervened on behalf of the elderly couple.
The union intervened on behalf of the workers.
3
intervene with + suggestion

Adding a comment or action

With can introduce the means or content of the intervention.

He intervened with a warning.
She intervened with a compromise proposal.

See the difference in context

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

Construction
Example
Meaning
intervene in
The court intervened in the matter.
standard pattern for involvement in a situation
intervene on
The charity intervened on behalf of the family.
used mainly in the phrase on behalf of
intervene with
He intervened with a short comment.
with introduces the method or content
intervene at
Police intervened at the scene.
at gives a location or event, not a fixed verb pattern
intervene by
The agency intervened by issuing new rules.
by introduces the method used

Common mistakes

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

Using on without a clear phrase

Intervene on alone sounds incomplete in most contexts.

✕ The manager intervened on the argument. ✓ The manager intervened in the argument.

Using at for involvement

At usually marks location, not participation.

✕ They intervened at the conflict. ✓ They intervened in the conflict.

Confusing by with the main pattern

By explains how the intervention happened.

✕ The organisation intervened by the dispute. ✓ The organisation intervened in the dispute.

Quick practice

Choose the expression that matches the intended meaning.

1. The minister refused to intervene ___ the legal case.
2. The lawyer intervened ___ behalf of the witness.
3. She intervened ___ a helpful suggestion.

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Frequently asked questions

Is intervene in always correct for conflicts?

Yes. Intervene in is the normal pattern for disputes, situations, and processes.

Can intervene with be used for people?

Usually with introduces a suggestion, comment, or action rather than the person affected.

What does intervene by mean?

It explains the method of intervention, such as intervening by changing a policy.

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