Subject-verb agreement means that the subject of a sentence and the verb must match in number: singular (one) or plural (more than one). Let's correct the sentences you provided step by step:
- The dogs runs quickly.
- Here, the subject is dogs, which is plural. The verb runs should also be in the plural form.
- The correct form is: The dogs run quickly.
- Neither the teacher nor the students was happy with the result.
- In this sentence, we have a case of neither... nor... which means we should look at the subject that is closest to the verb. Students is plural, so we need a plural verb.
- The correct form is: Neither the teacher nor the students were happy with the result.
In summary, always ensure that your verb agrees with the subject in number. If the subject is plural, use a plural verb.