1. The  subject of the sentence (the noun which does the action of the verb or predicate)
2.  Predicate Nominative (answering the question whom or what following any form of the verb to be)

1. Direct Object (answers the question whom or what except following a form of to be verb)
2. Destination of a verb of motion (answers whither/where to)

1. Location
2. About whom or About what

1. Negated direct object
2. Absent subject noun
3. Expressions of quantity
4. 2-3-4 Rule
5. Animate , Masculine, Direct Object (Rather than Accusative)
6. ON a certain date
7.  Y- used to designate location in terms of a person
8. Possession/Ownership (Eng: apostrophe or of)

1. Indirect object (To whom, for whom)
2. Certain prepositions
3. Motion up to/ vertical object

TOGETHERNESS 

1.  with preposition "c" (with whom)
2. Temporal quality following verb to be in the past and future tenses (i was a good student)
3. with verbs: to study, to use, to become, to work as