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Prepositions after use

Use in, for, by, as or to?

Different prepositions with use express purpose, method, role, or context.

Quick answer

Common patterns with use

Use for expresses purpose, use as expresses a role or function, and use in introduces a context or activity. Use by usually introduces method in passive structures. Use to is followed by a verb.

We use for storage.
She used as a reference.
The software is used in schools.
It can be used to create charts.

Choose the pattern by meaning

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

1
use for + purpose

Showing purpose or function

Use for explains what something is intended to do.

This knife is used for cutting bread.
The room is used for meetings.
2
use as + role

Giving something a role or identity

Use as means that something serves in a particular role.

They used as a temporary office.
The cloth was used as a bandage.
3
use in + context

Referring to a field or situation

Use in introduces the place, activity, or area where something is used.

The method is used in medicine.
These terms are used in legal writing.
4
use by + method or agent

Explaining means in passive structures

By often appears in passive constructions to show method or the person performing an action.

The machine is used by engineers.
The data was used by the research team.
5
use to + verb

Following use with an infinitive

Use to is followed by a base verb to describe purpose.

We use to measure temperature.
She uses to track expenses.

See the difference in context

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

Construction
Example
Meaning
use in
The device is used in hospitals.
Shows the context or field.
use for
We use this app for scheduling.
Shows purpose.
use by
The tool is used by mechanics.
Shows the user or agent in a passive structure.
use as
He used the box as a table.
Shows role or function.
use to
They use tablets to take notes.
Introduces an infinitive of purpose.

Common mistakes

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

Using use to with a noun

Use to should normally be followed by a verb.

✕ We use this tool to communication. ✓ We use this tool for communication.

Confusing for and as

For expresses purpose, while as expresses role.

✕ They used the chair for a ladder. ✓ They used the chair as a ladder.

Adding by instead of for

By usually introduces an agent or method, not purpose.

✕ This brush is used by painting. ✓ This brush is used for painting.

Omitting the verb after use to

Use to needs a base verb after it.

✕ We use this software to reports. ✓ We use this software to create reports.

Quick practice

Choose the expression that matches the intended meaning.

1. This tool is used ___ cleaning windows.
2. The old factory was used ___ a warehouse.
3. These methods are used ___ engineering.

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Frequently asked questions

What is the difference between use for and use as?

Use for describes purpose, while use as describes a role or identity.

Can use to be followed by a noun?

Usually no. Use to is normally followed by a base verb such as use to measure.

When do we use by after use?

By commonly appears in passive structures to show who uses something or the method involved.

uncover, by, uncover, in "underline by" or "underline in"? undermine by, in, at, from or due? underpin by, for, with, of or other? underscore by, in, with, between or during? understand by, in, about, as or from? "undertake by" or "undertake in"? undo by, in, against, during or From? "unearth from" or "unearth by"? unfold in, before, on, at or for? "unite in" or "unite with"? "unleash on" or "unleash by"?

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