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Prepositions after verbs

Assure with prepositions

The most common pattern is assure someone of something. Other prepositions usually belong to another part of the sentence.

Quick answer

Common patterns with assure

Use assure someone of something to give confidence or certainty. “Assure to” is uncommon in modern English. By, in, and for usually introduce manner, place, or purpose rather than forming a fixed pattern.

They assured us of their support.
I can assure you that the report is accurate.

Choose the pattern by meaning

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

1
assure someone of + noun

Give confidence about something

This is the standard pattern after assure.

She assured him of her loyalty.
2
assure someone that + clause

State something confidently

That-clauses are very common with assure.

The doctor assured me that the treatment was safe.
3
assure by + method

By as an adjunct

By can describe means, not a fixed pattern.

They reassured customers by sending updates daily.
4
assure for + purpose

For in purpose expressions

For may introduce a purpose or benefit phrase.

The policy was designed for long-term security.

See the difference in context

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

Construction
Example
Meaning
assure someone of something
He assured us of his honesty.
Standard pattern meaning give confidence.
assure someone that
She assured me that everything was ready.
Standard clause pattern.
assure to
They assured to help.
Nonstandard or awkward in modern English.
assure by
They assured clients by email.
By introduces method or means.

Common mistakes

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

Using assure to + verb

Modern English prefers promise to or assure someone that.

✕ He assured to arrive early. ✓ He promised to arrive early.

Omitting the object person

Assure usually includes the person receiving assurance.

✕ She assured of success. ✓ She assured us of success.

Quick practice

Choose the expression that matches the intended meaning.

1. The manager assured employees ___ job stability.
2. I assure you ___ the data is correct.
3. Which is most natural?

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Frequently asked questions

What is the most common pattern with assure?

Assure someone of something and assure someone that are the main patterns.

Is “assure to” correct?

It is usually avoided in modern English.

Can by follow assure?

Yes, but by usually introduces a method, not a fixed verb-preposition pattern.

abandon, by, abandon, in "abduct by", "abduct in" or "abduct from"? abide by, in, with, to or on? "abolish in" or "abolish by"? "abound in" or "abound with"? "absorb by", "absorb into" or "absorb in"? "accelerate by", "accelerate to" or "accelerate in"? accentuate by, with, in or under? accept by, in, as, for or into? "accommodate in", "accommodate for" or "accommodate to"? "accomplish by" or "accomplish in"? "accord to" or "accord with"?

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