When a verb of action is complete in itself and such an action of the subject is not required to be transited or passed on to anything or anyone else, the verb of action is called Intransitive Verb.
Look at the following sentences:
a. My mother yawned.
b. (You) Run!
In these sentences, the action of the subject is complete in itself and the verbs 'yawned', 'run' are intransitive verbs.
We can identify a transitive verb and an object in a simple mechanical way. If we simply question with 'what' and/or 'whom after a verb of action and such a question remains meaningful, the verb will be a transitive verb and answer to such a question will be the object.
Let us take the following sentences:
I gave a Ramesh book.
a. Gave whom? Ramesh.
b. Gave what? A book.
Here 'gave' is a transitive verb and 'Ramesh' and 'a book' are objects.
When the object is a person, it is called an Indirect Object and when it is a thing, it is a Direct Object.
Similarity: Both complete the incomplete predicate of a sentence.
Difference: An object completes the incomplete predicate of a transitive verb, whereas a complement completes the incomplete predicate of a verb of state.
Similarity: Both complete the incomplete predicate of a sentence.
Difference:
1. Subjective Compliment is related to the subject, whereas, the objective complement is related to the object.
2. In case of subjective complement, the finite verb is a verb of state, whereas, in case of Objective Complement the finite verb is a transitive verb.
It will be important to note here that
1. All objects are Noun,
2. When the subjective complement is one and the same person or thing as the subject, the complement is Noun;
3. When the objective complement is one and the same person or thing as the object, the complement is noun.