Sometimes "S/V Agr" is a bit tricky because (a) other words and phrases can come in between the subject and the verb, and the writer is tricked into matching the verb to a noun just in front of it instead of the subject which may be farther away; or, (b) sometimes, the writer tries to match the verb to a noun that follows it, instead of to the subject which comes before it.
Look at this sentence for an example of (a):
Another concern that teachers have are the problems of their students.
Here, the writer wants to match the verb of the sentence to the nearest noun, "teachers." However, that noun isn't the subject of the sentence, and, besides, it has its own verb ("have"). Actually, the word "concern" is the subject of the sentence ("another concern ... is ...."). Here is the corrected sentence:
Another concern that teachers have is the problems of their students.
Look at this sentence for an example of (b):
Another tool that a graphic artist needs are the brushes of the paintbox.
Here, the writer wants to match the verb of the sentence to a noun which follows it, "brushes." However, that noun isn't the subject of the sentence. Actually, the word "tool" is the subject ("another tool ... is ...."). here is the corrected sentence:
Another tool that a graphic artist needs is the brushes of the paintbox.
Here, "brushes" is singular (as a group).
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