As we all know a main clause (also know as an independent clause) must contain both a subject and a verb that must agree. Meaning, if the subject is singular, the verb must be singular, and if the subject is plural, the verb must be plural.
Now let me give an example of a grammatically correct sentence that sounds awful with an agreeing verb-subject.
"A group of people is playing in the park."
The singular subject "group" agrees with the singular verb "is", yet this sentence sounds awkward, clumsy and, more importantly wrong.
Is this sentence grammatically correct? If not, why not? It looks perfect good to me, yet it sounds bloody awful.
There has been much debate between me and my friends over this and we would be grateful for any help.
It should be 'are'. A group of people are playing in the park. People would be the subject here and playing is still the verb.
The exact same dilemma exists in my own language (and I assume in many other languages as well), and the official grammatical rule to follow is simply to identify which noun is the proper subject.
Which between 'group' and 'people' makes more sense to accept as the subject? It can really depend according to the sentence and/or the context:
In "A group of people are playing" or "A group of people are talking", it makes more sense if 'people' is the subject; many different individuals are interacting with one another, on an individual basis.
In "A group of people is waiting" or "A group of people is singing", it makes more sense if 'group' is the subject; many individuals are performing the exact same action as a whole.
Generally, the one that 'sounds' better is often the correct choice. There are some cases where both could be accepted though, for example "A flock of birds is flying" or "A flock of birds are flying". In this instance you could simply choose according to the emphasis you want to give: do you intend to describe birds that are flying together as a whole, or many different birds that are all flying individually?
My humble opinion on the matter is as follows.
'A group' is a singular subject so the verb 'is' is correct.
'of people' is a prepositional phrase describing the group.
'Playing in the park' describes the action denoted by the verb.
The sentence is technically correct.
Thank you all for your replies. You've all been very helpful and I'm entirely grateful.
Chrissielecker, you are obviously a very intelligent person, and I'm very impressed with your answer. But I'd like to add one more thing, if I may.
Here's an interesting way to look at it. Rearrange the words in the sentence.
"There is a group of people playing in the park."
It sounds perfect with the predicate closer to subject. It's placing the singular verb "is" next to the plural noun "people" that makes it sound so awful.
So my original sentence is grammatically correct. But ChrissieLecker summed it up perfectly. Collective nouns can be a pain. They can be used as singular or plural. However, there is no written rule on the matter. It's a dark area as far as I can tell.
So remember this: If in doubt, rearrange the words. :d/
Another way to analysis the sentence -- and this is something I learned many years ago when I was an ickle girl -- is strip away the descriptive words so you're left with the very core of the sentence.
In this case the core of the sentence would read: "A group is playing".
Sounds much better than "A group are playing", don't you think?
Nevermind, your amended post doesn't make me question anything at all. it was the previous version.
Carry on.