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Weekly Error

Change

The principal [problem] with these programs [are] conflicting codes.

 

To

The principal [problem] with these programs [is] conflicting codes.

 

Subject-verb agreement:

Note:  In sentences like this one, in which the subject (principal problem) is singular and its complement (conflicting codes) is plural, the verb agrees with the subject.

 

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See Error Checklist for a compilation of 75 common writing errors.

For more exercises in identifying common errors,
take the M.B.A. exam and
the Punctuation and Grammar Challenges.