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Prepositions with nouns

Of forum, in forum, or on forum?

Use in a forum for participation within a discussion setting and on a forum for activity on a website. Of forum usually belongs to larger noun phrases.

Quick answer

Which preposition should you use with forum?

Use on a forum for online platforms and discussions posted on websites. Use in a forum for participation within a discussion event or space. Of the forum is usually part of a larger phrase such as members of the forum.

She posted the question on the forum yesterday.
The issue was discussed in the forum.
Several members of the forum attended the meeting.

Choose the pattern by meaning

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

1
on a forum

Activity on an online discussion site

Use on a forum for posting, reading, or interacting on a website forum.

I found the answer on the forum.
Users complained on the forum about the update.
2
in a forum

Participation within a discussion setting

Use in a forum for discussions happening within a meeting, event, or organized discussion space.

Experts debated the topic in the forum.
The proposal was introduced in a public forum.
3
members of the forum

Belonging to a forum

Use of the forum after another noun to show connection or membership.

Several members of the forum shared their opinions.
The rules of the forum are strict.

See the difference in context

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

Construction
Example
Meaning
on forum
She asked the question on the forum.
correct for activity on an online forum
in forum
The policy was debated in the forum.
correct for discussion within a forum setting
of forum
The moderators of the forum removed the post.
natural only inside a larger noun phrase
at the forum
He spoke at the forum yesterday.
used for attendance or speaking at an event called a forum

Common mistakes

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

Using on the forum for physical events

Use at the forum or in the forum for real-world meetings or discussion events.

✕ She spoke on the forum in Berlin. ✓ She spoke at the forum in Berlin.

Using of forum without another noun

Of forum is incomplete unless another noun comes before it.

✕ They discussed of forum. ✓ They discussed the rules of the forum.

Confusing in the forum and on the forum

In the forum refers to discussion within a setting. On the forum usually refers to an online platform.

✕ I posted it in the forum website. ✓ I posted it on the forum website.

Quick practice

Choose the expression that matches the intended meaning.

1. He shared the link ___ .
2. The proposal was discussed ___ during the conference.
3. The administrators ___ updated the rules.

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Frequently asked questions

Should I say on the forum or in the forum?

Use on the forum for online websites. Use in the forum for discussions happening within a meeting or organized setting.

Is on forum correct without an article?

Usually English uses an article or determiner, such as on the forum or on a forum.

Can of forum stand alone?

No. It normally follows another noun, such as members of the forum or rules of the forum.

of, about, against, to or for racism? of, about, for, in or on friendship? of, about, for, on or to thing? of, about, for, to or with sex? of, about, on, to or for moon? "of access" or "with access"? "of accommodation" or "for accommodation"? "of accuracy" or "for accuracy"? "of action" or "in action"? "of actor", "with actor" or "by actor"? "of address" or "to address"? "of administration" or "in administration"?

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