Prepositions after verbs

justify in or justify by?

Justify usually takes a direct object. Justify by is used for means or evidence. Justify in is uncommon as a direct verb-preposition combination and usually introduces a place or context.

Quick answer

Which preposition is correct after justify?

Use justify by when you explain the method, evidence, or action that supports something. Do not normally use justify in directly after the verb to mean support or defend. In can still appear as a separate phrase showing context or location.

The company tried to justify the decision by citing safety concerns.
She cannot justify her absence by blaming traffic.
There is nothing to justify in this report.

Choose the pattern by meaning

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

justify + noun

State what is defended or explained

Justify is commonly followed directly by the thing being defended, explained, or proven reasonable.

They could not justify the expense.

He tried to justify his behaviour to the committee.

justify + noun + by + method/reason

Explain how something is justified

Use by to introduce evidence, reasoning, or actions that support the justification.

The editor justified the changes by referring to the style guide.

She justified the delay by pointing to the storm warnings.

justify in + context

Use in for a separate context phrase

In can follow justify when it introduces a context, field, or location rather than forming a fixed verb-preposition pair.

The policy is difficult to justify in economic terms.

How do you justify this decision in a public institution?

See the difference in context

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

Construction

Example

Meaning

justify by

They justified the increase by presenting new data.

Standard for showing the reason, method, or evidence.

justify in

It is hard to justify the project in financial terms.

In introduces a context or framework, not a fixed combination with justify.

justify with

He justified his choice with detailed examples.

Also natural for introducing supporting evidence.

Common mistakes

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

Using justify in as a fixed replacement for justify by

In usually introduces context, not the supporting reason itself.

✕ She justified the decision in citing the budget. ✓ She justified the decision by citing the budget.

Adding an unnecessary preposition

Justify often takes a direct object without a preposition.

✕ They justified for the delay. ✓ They justified the delay.

Confusing context with reason

Use in for fields or situations, and by for evidence or method.

✕ He justified the plan in using surveys. ✓ He justified the plan by using surveys.

Quick practice

Choose the expression that matches the intended meaning.

1. The lawyer justified the argument ___ referring to earlier cases.

2. It is difficult to justify the policy ___ economic terms.

3. They could not ___ the extra spending.

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Frequently asked questions

Is justify by correct?

Yes. Use justify by to introduce evidence, reasoning, or actions that support something.

Is justify in incorrect?

Not always. It is uncommon as a fixed verb-preposition pair, but natural when in introduces a context such as in legal terms or in this situation.

Can justify be used without a preposition?

Yes. Justify often takes a direct object, as in justify the decision or justify the cost.

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