At the beginning of English learning, a simple sentence looks like this below:
There is a group of students singing and dancing....
However if it's changed to:
A group of students are singing and dancing...
Notice the verb agreement is changed from the singular form (is) to the plural form (are).
But is it also possible to say "There're a group of students...' (enhancements of "students" as the plural form) or 'A group of students is ....' (take the collective unit word (group) as a whole)?
What's more: There're TOO MANY collective English unit words such as "collection"/"pile"/"series"/"set"/"gang"/"crown"...So I wonder:
Are both "plural form of verbs" and "singular form of verbs" grammartically right, depending on what you focus on?
What's often used in practice for the native speakers?