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Prepositions after verbs

Underpin by, for, with, of or other?

Underpin usually takes a direct object. With is common for supporting material or ideas, while other prepositions often belong to the wider sentence structure.

Quick answer

How to use underpin

Use underpin with a direct object: underpin a theory, underpin growth. With commonly introduces supporting evidence or material. By can introduce means in passive structures. For and of are usually part of larger noun phrases, not fixed combinations with underpin.

underpin the argument
The claims are underpinned with strong evidence
The economy was underpinned by stable demand

Choose the pattern by meaning

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

1
underpin + object

Supporting something

Underpin usually takes a direct object directly.

underpin the strategy
underpin economic growth
2
underpin + object + with + support

Showing supporting material

With introduces evidence, resources, or supporting elements.

The proposal is underpinned with detailed research
The programme was underpinned with public funding
3
be underpinned by + source

Naming the supporting force

Passive forms with by identify what provides the support.

The agreement is underpinned by mutual trust
Growth was underpinned by low interest rates

See the difference in context

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

Construction
Example
Meaning
underpin + object
Data underpins the report.
Standard active structure.
be underpinned by
The system is underpinned by clear rules.
Common passive pattern showing the source of support.
underpin with
The theory is underpinned with evidence.
With introduces supporting material.
underpin for
They created a framework for future growth.
For usually belongs to another phrase, not directly to underpin.
underpin of
The underpinning of the policy is unclear.
Of is more natural with the noun underpinning, not the verb underpin.

Common mistakes

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

Using an unnecessary preposition

Underpin often works best with a direct object.

✕ These ideas underpin for the policy. ✓ These ideas underpin the policy.

Confusing verb and noun forms

Of commonly follows the noun underpinning, not the verb underpin.

✕ The evidence underpins of the claim. ✓ The evidence underpins the claim.

Quick practice

Choose the expression that matches the intended meaning.

1. The reforms were underpinned ___ strong public support.
2. The report is underpinned ___ recent research.
3. Choose the correct sentence.

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Frequently asked questions

Is underpinned by common?

Yes. It is a standard passive structure used to show what supports something.

Can I use underpin with with?

Yes. With can introduce evidence, funding, or other support.

Is underpin for correct?

Usually no. For normally belongs to another phrase in the sentence rather than directly following underpin.

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