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Prepositions with nouns

Using "assistance" with prepositions

"For assistance" is common when asking for help. "Of assistance" appears mainly in the expression "be of assistance."

Quick answer

Which phrase should you use?

Use "for assistance" when requesting help or stating purpose. Use "of assistance" mainly after the verb "be," as in "May I be of assistance?"

Call this number for assistance.
Our staff will be of assistance during the event.

Choose the pattern by meaning

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

1
for assistance

Requesting or offering help

Use this phrase when someone needs support or guidance.

Please contact reception for assistance.
2
be of assistance

Offering help formally

This formal expression means "be helpful."

The technician was of assistance throughout the repair.
3
assistance with + task

Naming the task involved

Use this pattern to specify the area of help.

She asked for assistance with the application.
4
assistance from + person

Naming the source of help

Use this structure to identify who provides support.

We received valuable assistance from volunteers.

See the difference in context

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

Construction
Example
Meaning
for assistance
Visitors can ask for assistance at the desk.
Used for requests or intended help.
of assistance
I hope this guide is of assistance.
Formal expression meaning helpful.
assistance with
He needs assistance with the software.
Specifies the task or problem.
assistance from
The team received assistance from local experts.
Identifies the helper.

Common mistakes

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

Using "of assistance" without a verb

This phrase usually follows forms of "be."

✕ Call us of assistance. ✓ Call us for assistance.

Using "for assistance" after "be"

After "be," English usually uses "of assistance."

✕ This guide is for assistance. ✓ This guide is of assistance.

Confusing formal and neutral style

"Be of assistance" sounds more formal than "help."

✓ May I be of assistance?

Quick practice

Choose the expression that matches the intended meaning.

1. Please call the hotline ___ assistance.
2. I hope this document is ___ assistance.
3. She asked for assistance ___ her visa application.

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Frequently asked questions

Is "be of assistance" formal?

Yes. It is more formal than simply saying "help."

Can I say "for assistance" in customer service messages?

Yes. It is very common in notices and instructions.

What is the difference between "of assistance" and "for assistance"?

"Of assistance" describes something as helpful, while "for assistance" refers to requesting or receiving help.

of, about, against, to or for racism? of, about, for, in or on friendship? of, about, for, on or to thing? of, about, for, to or with sex? of, about, on, to or for moon? "of access" or "with access"? "of accommodation" or "for accommodation"? "of accuracy" or "for accuracy"? "of action" or "in action"? "of actor", "with actor" or "by actor"? "of address" or "to address"? "of administration" or "in administration"?

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