Once again, from Paul Brians’ book Common Errors in English Usage, here is a worksheet on subject-verb agreement when using the noun group. Did you know you know it is used as both a plural and singular, depending on what one needs to say about a group? I did not before preparing this worksheet.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.