Answer :
The above phrase contains a subject-verb agreement problem, which is that there should be are before the word three instead of is.
Subject-verb agreement: What does it mean?
According to the other words it is related to, a word might alter form, which is referred to as agreement or concord in linguistics. It's an illustration of inflection and often involves "lining up" a number of words or phrase components with varying grammatical values. The subject-verb agreement grammatical rule states that the number, person, and gender of the subject must all be matched by the verb or verbs in a sentence.
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The following question is incomplete the complete question is as follows:
Find the error with subject-verb agreement. select the incorrect verb and type it correctly. on the ledge there is three potted geraniums that desperately need water. however the hanging ferns in the living room are thriving. THE ANSWER TO THIS IS (ARE) INSTEAD OF (IS)