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Prepositions after verbs

Substantiate by or substantiate with?

Substantiate is most naturally followed by with when introducing evidence or supporting material.

Quick answer

Substantiate with vs. substantiate by

Use substantiate with to introduce evidence, examples, or data. Substantiate by is uncommon as an active verb pattern; by may appear in passive structures to identify the means or agent.

The scientist substantiated the claim with new data
You must substantiate your argument with evidence
The allegations were substantiated by witness statements

Choose the pattern by meaning

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

1
substantiate with + evidence

Introducing supporting proof

With is the standard preposition after substantiate.

He substantiated his theory with laboratory results
The report was substantiated with detailed records
2
be substantiated by + source

Using passive structures

By introduces the evidence or source in passive sentences.

The accusations were substantiated by emails and receipts
Her account was substantiated by multiple witnesses
3
substantiate + claim

Using a direct object

Substantiate often takes a direct object without any preposition.

They could not substantiate the rumours.
The audit substantiated the complaint.

See the difference in context

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

Construction
Example
Meaning
substantiate with
Please substantiate your conclusions with evidence.
standard pattern for adding supporting material
substantiate by
The findings were substantiated by independent tests.
mostly used in passive clauses with by
substantiate through
The case was substantiated through financial records.
through emphasises the method or process
substantiate on
The claim was substantiated on several points.
not a standard pattern after substantiate

Common mistakes

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

Using by in active clauses

With is usually more natural after active substantiate.

✕ She substantiated her argument by documents. ✓ She substantiated her argument with documents.

Adding an unnecessary preposition

Substantiate can take a direct object alone.

✕ They substantiated about the claim. ✓ They substantiated the claim.

Using nonstandard on after substantiate

On is not a usual complement for this verb.

✕ He substantiated the theory on evidence. ✓ He substantiated the theory with evidence.

Quick practice

Choose the expression that matches the intended meaning.

1. The lawyer substantiated the accusation ___ financial records.
2. The allegations were substantiated ___ several witnesses.
3. The committee could not substantiate ___ .

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Frequently asked questions

Is substantiate with the normal pattern?

Yes. It is the standard way to introduce evidence or support.

Can substantiate by be correct?

Yes, mainly in passive constructions such as substantiated by evidence.

Does substantiate always need a preposition?

No. The verb often takes a direct object alone, such as substantiate a claim.

sack, by, sack, for, sack, from "sacrifice for" or "sacrifice to"? sail from, in, for, to or through? "salvage from" or "salvage in"? sanction by, for, in, with or according? satisfy with, by, in, about or after? "saturate with" or "saturate in"? save by, for, from, on or in? "say in", "say about" or "say to"? "scan for", "scan in" or "scan through"? "scar by" or "scar on"? scatter in, across, around, throughout or on?

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