The plural of forum is actually quite straightforward - it's "forums"!
In English, we typically add an "s" to a singular noun in order to indicate that there is more than one of that thing. So, if you were talking about more than one forum, you would say "forums."
For example, you might say: "I've been browsing a lot of different forums lately. There are so many interesting discussions happening in different forums all over the internet."
I hope that clears things up for you! If you have any more questions about language, don't hesitate to ask.
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