I often see "What tools is/are everybody using?" and other sentences of same form used with both is and are. Which one is the correct way to write the question?
What tools is everybody using?
What tools are everybody using?
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Technically, this is really more about whether to say "everybody is" or "everybody are", because the tools aren't doing anything in this sentence. We use "everybody is", so "What tools is everybody using?" would be the more correct choice, technically.
However, that really grates on the ear. Personally, I might just go with "...are..." in a casual setting, and everybody would get the idea. But in a more formal setting, the answer with something like this is to rephrase. The devil is in the details.
Peter Shor's suggestion of "What tools are being used by everyone?" might be interpreted as saying that only those tools that are being used by literally every user would qualify.
Another possibility is "What are the tools that everybody is using?", which also emphasizes "everybody" a little more than your original, but a little less than Peter's (in my opinion).
EDIT: David K has suggested a good alternative: "What set of tools is everyone using?" If you're talking about computing, this could also be "What toolset is everyone using?"
I can't cite the specific rule, but just sounding it out would lead me to:
"What tool is everyone using?"
"What tools are everyone using?"
Use 'is' for a single item, 'are' for plurals. I think 'are' would be appropriate if you were asking just one person, regardless of how many tools. This isn't as clear cut, but for this particular organization, I think this holds true. If you were talking about someone else (he/she), then 'is' seems to be the correct form.
"What movies are you watching?" vs. "What movie are you watching".
"What tool is he using?" vs. "What tools is he using?"
Both forms use are/is, but "What is your favorite movie?" vs. "What are your favorite movies?" follow the previous pattern in your question. Probably because the item being asked about follows the user.