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Preposition after verb

Amplify by, in, for, from or into?

Amplify usually takes a direct object. Different prepositions after amplify have different meanings, and some are much more natural than others.

Quick answer

Which prepositions work with amplify?

Use amplify with a direct object for increasing sound, effect, or importance. Amplify by is common for methods or amounts. Amplify into can describe transformation. Amplify in, amplify for, and amplify from are uncommon as direct verb patterns and usually belong to separate phrases in the sentence.

The device amplifies sound clearly.
They amplified the signal by 20%.
The debate amplified into a national controversy.

Choose the pattern by meaning

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

1
amplify + object

Increasing sound, effect, or importance

Use amplify directly with the thing that becomes stronger or larger.

The speakers amplified the music.
Social media can amplify rumours quickly.
2
amplify + object + by + amount or method

Showing how much or how something increases

By introduces a measurement, percentage, or method.

The software amplified the image by 50%.
They amplified the signal by using a stronger antenna.
3
amplify into + result

Describing growth into a larger situation

Into can show that one situation develops into another.

A small disagreement amplified into a major conflict.
The issue amplified into a public debate.
4
amplify for + audience or purpose

Explaining who benefits from the amplification

For can appear with a purpose or audience, although it is not tightly linked to the verb itself.

The system amplified the speaker's voice for the audience.
They amplified the message for online viewers.

See the difference in context

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

Construction
Example
Meaning
amplify by
The engineer amplified the signal by 10%.
Standard for amount, degree, or method.
amplify in
Noise increased in the tunnel.
In usually acts as a place adjunct, not a standard pattern after amplify.
amplify for
They amplified the announcement for the crowd.
Possible when for introduces the audience or purpose.
amplify from
The sound travelled from the stage.
From is not a usual complement after amplify; it more often marks source in the wider sentence.
amplify into
The discussion amplified into a wider argument.
Natural for development into a stronger or larger state.

Common mistakes

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

Using amplify in as a fixed pattern

In usually describes location rather than following amplify directly.

✕ The device amplifies in the signal. ✓ The device amplifies the signal.

Using from directly after amplify

Amplify does not normally take from as its complement.

✕ The system amplified from the sound. ✓ The system amplified the sound.

Forgetting the direct object

Amplify usually needs the thing being increased or strengthened.

✕ The software amplified by 30%. ✓ The software amplified the image by 30%.

Quick practice

Choose the expression that matches the intended meaning.

1. The app amplified the image ___ 40%.
2. A local issue amplified ___ a national debate.
3. The microphone amplified ___ clearly.

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Frequently asked questions

Can amplify be used without a preposition?

Yes. Amplify commonly takes a direct object, as in amplify sound or amplify a message.

Is amplify by correct?

Yes. It is standard for amounts, degrees, or methods: amplify by 20%, amplify by using software.

When is amplify into used?

Use amplify into when one thing grows or develops into a stronger or larger result.

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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