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preposition after verb

How to use "implement" with prepositions

Implement usually takes a direct object. In and by often add place or deadline information.

Quick answer

Common structures

Use implement something for the action itself. In can show where something is implemented, and by often gives a deadline or method.

implemented in schools
implemented by June

Choose the pattern by meaning

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

1
implement + plan/policy

Naming what is put into effect

Implement commonly takes a direct object.

implement the policy
2
implemented in + place

Showing where something happens

In introduces the organisation, system, or place.

implemented in hospitals
3
implemented by + time

Giving a deadline

By often introduces a time limit.

implemented by next year
4
implemented by + agent

Naming who carries out the action

In passive clauses, by can introduce the agent.

The reforms were implemented by the ministry

See the difference in context

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

Construction
Example
Meaning
implement in
The software was implemented in all branches.
In shows location or context.
implement by
The changes must be implemented by Friday.
By usually shows a deadline or agent.
implement something
The company implemented new rules.
Direct object pattern.

Common mistakes

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

Using by as the location

By does not normally show where implementation happens.

✕ The system was implemented by schools. ✓ The system was implemented in schools.

Adding an unnecessary preposition

Implement directly takes the thing introduced.

✕ They implemented on a new policy. ✓ They implemented a new policy.

Quick practice

Choose the expression that matches the intended meaning.

1. The reforms were implemented ___ public hospitals.
2. The update must be implemented ___ Monday.
3. The company plans to ___ a new system.

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Frequently asked questions

Is "implement in" correct?

Yes, when in introduces the place or context.

Can I use "implement by"?

Yes. It commonly introduces a deadline or the agent in a passive sentence.

Does implement need a preposition?

Not usually. The verb often takes a direct object.

identify-with-by-in-as, for "ignore by" or "ignore in"? illuminate by, with, at, for or in? "illustrate by" or "illustrate in"? "imagine for", "imagine by" or "imagine in"? imbue with, in, by or onto? immigrate to, from, in, with or into? impair by, for, in, because or throughout? "impart to", "impart in" or "impart by"? "impeach by" or "impeach for"? "impinge on" or "impinge upon"? "imply by" or "imply in"?

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