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Preposition after verb

touch on vs touch by

Touch on is a common idiomatic expression meaning to mention something briefly. Touch by is not a standard fixed combination.

Quick answer

Which form is correct?

Use touch on when you mean mention briefly or discuss quickly. Do not use touch by as a fixed verb-preposition pattern. By may appear separately in sentences about movement or agency.

The speaker touched on climate policy briefly.
We only touched on the budget issue during the meeting.
Her comments touched on several concerns.

Choose the pattern by meaning

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

1
touch on + topic

Mentioning something briefly

Touch on commonly means to discuss or mention a subject briefly.

The article touches on privacy concerns.
2
touch + object

Making physical contact

Touch can also take a direct object without a preposition.

Please do not touch the screen.
3
touch by + agent/place

Using by separately in the sentence

By is not selected by touch here; it introduces another idea such as agency or movement.

The painting was touched by several restorers.

See the difference in context

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

Construction
Example
Meaning
touch on
She touched on the main problem.
Mention briefly or discuss quickly.
touch by
The statue was touched by visitors.
By introduces the agent in a passive sentence, not a fixed verb-preposition combination.
touch + object
He touched the wall.
Physical contact with something.

Common mistakes

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

Using by instead of on

Use touch on for brief discussion.

✕ The report touched by several topics. ✓ The report touched on several topics.

Adding an unnecessary preposition

Physical touch normally takes a direct object.

✕ She touched on the table. ✓ She touched the table.

Quick practice

Choose the expression that matches the intended meaning.

1. The lecture briefly ___ modern art.
2. Please do not ___ the exhibits.
3. The old photo was touched ___ water damage.

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Frequently asked questions

What does touch on mean?

It means to mention or discuss something briefly.

Is touch by correct?

Not as a fixed expression. By may appear in passive sentences such as touched by emotion.

Can touch be used without a preposition?

Yes. Physical contact usually takes a direct object, such as touch the door.

tackle by, in, for, with or on? tack-on-onto-to-across, as "tag with" or "tag in"? tailor to, for, from, toward or towards? "taint by" or "taint with"? "take into", "take in" or "take to"? "talk about" or "talk to"? tally with, in, for, up or at? "tap into" or "tap on"? target at, by, for, to or in? tarnish by, in, with, after or as? "taste like", "taste of" or "taste in"?

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