A. Agreement of subject and verb
Agreement in Number
Agreement in Person
B. Agreement of Compound Subjects and their Verbs
Subjects joined by and
Subjects joined by or
Subjects containing a singular and a plural noun
C. Agreement of Modified Subjects with their Verbs
Subjects taking either, neither, each, every, one, many a, one of, or more than one
Subjects taking a lot of, some of, most of, none of, and the rest of,
Subjects taking A group of and a number of,
D. Agreement of Collective Nouns as Subjects and their verbs
E. Exceptional Cases (that do not follow rules)
Subjects joined by and but modified by each
Two nouns joined by and but representing one idea
All when it means 'everything'