The audience of Justin Bieber concert is/are very high!
The staff of Company A has/have low morale right now.
Should I use is/are or has/have in above case?
The audience of Justin Bieber concert is/are very high!
The staff of Company A has/have low morale right now.
Should I use is/are or has/have in above case?
This can vary depending on if you speak British or American English, but to be correct I have written the British version. I have added a link in the bottom that can help you understand the difference.
"Staff" and "audience" are both collective nouns, nouns that represents many people (in theory) but is considered grammatically singular.
Therefore,
The audience of Justin Bieber concert is very high!
The staff of Company A has low morale right now.
is correct.
For more information, see this EL&U post Does “staff” take a plural verb? .