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How to understand whether it is necessary to put the article before this word and before other words like this? Dictionaries like this(enter link description here) don't give explanations or something I don't understand.
The audience on the stage. People on stage.
There were over 50 people on stage. There were 50 people on the stage.
etc.
on stage, onstage and on the stage are very similar. In everyday life, you can use any.
on stage and onstage usually refer to the general setup where an artist goes to a place (e.g. theater) to give a performance.
on the stage refers to the specific place, usually a raised platform, where the artist will stand / sit / dance... during the performance
