Everybody, everything, nobody - переводиться как каждый, каждое, никто и употребляется в единственном числе. В английских предложениях всегда ОДНО отрицание, т. е. если есть nobody то doesn't или don't или что-то похожее ни в коем случае не может быть
1.Everybody has problems.
Everybody feels tired today.
Everything looks strange.
Nobody feels hungry.
Everybody is busy.
2. Everybody is busy.
Everybody has questions.
Everybody is scared.
Everybody looks tired.
Everybody feels fine.
3. Nobody wanted to go there.
Nobody looked tired.
Nobody saw them.
Nobody has heard this song.
Nobody felt hungry.