Can somebody me understand subject and verb agreement?

Making Subject and Verb Agree 

      Rules: 

1. At the point when the subject of a sentence is made out of at least two things or pronouns associated by and, utilize a plural verb. 

2. Whenever at least two solitary things or pronouns are associated by or nor, utilize a particular verb. 

3. At the point when a compound subject contains both a solitary and a plural thing or pronoun joined by or nor, the verb ought to concur with the piece of the subject that is closer the verb. 

       In this way, if a subject is solitary, its verb should likewise be particular; if a subject is plural, its verb should likewise be plural.