-----Basic Terms Definition-----

Q. : What is Case?
Ans. : Case tells us the position and function of a noun in any sentence. Case of any noun depends entirely on the use of the noun. It means that according to the need we can use a noun in any case.
There are six cases of noun in English. They are:-

1). Nominative/Subjective Case :-

When a noun is used as a “SUBJECT” of a verb, it is said to be in the “NOMINATIVE/SUBJECTIVE” case.

1).SUBJECT :-

Usually the doer of the action is called SUBJECT. Actually SUBJECT is that word or group of words about which something is said in the predicative part of the sentence.To find the SUBJECT put “WHO” or “WHAT” before the verb.

As :-

1). Ajay Mor teaches his students daily in the evening.

In the sentence above the doer of the action is Ajay Mor. So Ajay Mor is the SUBJECT of the verb teach.

2). Ajay Mor is a very hard working teacher.

In the sentence above there is no action. So Ajay Mor is not the doer of the action. But if we see the predicative part of the sentence, we'll find that whatever is said in the predicative part that is about Ajay Mor. So Ajay Mor is the SUBJECT in this sentence.

1).OBJECT :-

Usually in a sentence whatever comes after the verb is called OBJECT. Actually OBJECT is that word or group of words which receives the action of the verb. To find the OBJECT put “WHOM” or “WHAT” with the subject and verb.

As :-

1). Ajay Mor teaches physics to his students daily in the evening.

In the sentence above the doer of the action is Ajay Mor. So Ajay Mor is the SUBJECT of the verb teach. But whom/what does he teach. In other words who/what receives the action shown by the verb teach. Obviously “PHYSICS and HIS STUDENTS”. So they are the OBJECTS of the verb teach.

2). Ajay Mor is a very hard working teacher.

In the sentence above the verb shows only the state of being. So there is no action in this sentence. When there is no action, then how can we find the receiver of the action. No-one or nothing is there to receive the action means “NO OBJECT”.