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Prepositions after verbs

How to use prepositions with realize

Realize usually does not take a fixed preposition. Phrases with in, at, or by are possible only in specific contexts where the preposition belongs to another part of the sentence.

Quick answer

Does realize take in, at, or by?

Realize is normally used without a preposition before the object: realize a mistake, realize the truth. Phrases such as realize in, realize at, and realize by are not standard verb-preposition combinations. However, in, at, and by can appear after realize as separate time, place, or method expressions.

She realized her error immediately.
He realized the problem at once.
We realized the answer by checking the data.

Choose the pattern by meaning

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

1
realize + noun

Express becoming aware of something

Use realize directly with the thing understood or discovered.

I realized the truth too late.
They realized their mistake during the meeting.
2
realize + that clause

Introduce a full idea or fact

A that clause explains what someone became aware of.

She realized that she was wrong.
We realized that the train had left.
3
realize at + time

Add a time expression after realize

At is not selected by realize. It introduces a time phrase.

He realized the danger at midnight.
I realized my phone was missing at once.
4
realize by + method or deadline

Show method or time limit

By can describe how something was understood or the latest time something happens.

They realized the error by comparing the files.
She realized the truth by then.

See the difference in context

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

Construction
Example
Meaning
realize something
I realized my keys were gone.
Standard use without a preposition.
realize in
They realized the risk in the final stage.
In belongs to the following noun phrase, not to the verb realize.
realize at
She realized the mistake at once.
At introduces a time expression after the verb.
realize by
We realized the answer by checking the records.
By introduces method or means, not a fixed verb pattern.

Common mistakes

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

Adding an unnecessary preposition

Realize usually takes a direct object without a preposition.

✕ I realized about the problem. ✓ I realized the problem.

Treating realize in as a fixed pattern

Use in only when it belongs to another phrase in the sentence.

✕ She realized in the truth. ✓ She realized the truth.

Using realize for physical achievement

Realize can also mean make something real, but the structure changes.

✕ They realized at the project. ✓ They realized the project successfully.

Confusing realize and notice

Realize often refers to understanding, not simply seeing.

✕ I realized a bird outside the window. ✓ I noticed a bird outside the window.

Quick practice

Choose the expression that matches the intended meaning.

1. She ___ that the address was wrong.
2. We realized the mistake ___ checking the totals.
3. He realized the problem ___ once.

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Frequently asked questions

Can I say realize in something?

Not as a standard verb-preposition combination. In usually belongs to another phrase, such as realize the value in education.

Is realize at correct?

Only when at introduces a separate time or place phrase, such as realize it at once.

What is the most common structure with realize?

The most common structure is realize plus a noun or a that clause, such as realize the truth or realize that you were mistaken.

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