Subject Verb Agreement

Errors in agreement of subject and verb are most common. They at times pose a difficult problem because they are invariably the result of 'ingrained speech habits'. The difficulties arise when

1. Several other words intervene between your subject and verb.
2. The subject seems to be singular and plural at the same time.
3. Your word order is such that you may forget what your subject was and so make an error.

The general principal is this: The subject must agree with the verb in person and number. However, very few errors are made because of lack of agreement of person. Most mistakes arise out of your failure to match a singular subject with a singular verb, or a plural subjects with plural verb.

You can find the rules of subject-verb agreement in my other posts under the category Subject-Verb Agreement.