Which is the correct form of the sentence?
There has been many instances of outbreaks in vaccinated populations
vs.
There have been many instances of outbreaks in vaccinated populations?
The question that this is supposed to be a duplicate of does not mention there has or there have. We have many learners here who are not going to be able to deduce much of anything from it.
Answer
The correct one is:
There have been many instances of outbreaks in vaccinated populations.
This is because of instances/outbreaks being plural and have is the correct plural form. Has is singular.
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