Question

How can i identify the subject of the sentence and determine the verb that agrees with it?

Answer 1

Subjects and verbs must AGREE with one another in number (singular or plural). Thus, if a subject is singular, its verb must also be singular; if a subject is plural, its verb must also be plural.
Hopefully this helps.

Answer 2

The subject will always be a person, place, or thing. In other words, the noun inside the sentence.

The verb will be the action taken by the subject.

For example:

Elizabeth baptized her son in the water.

The subjects in this case is Elizabeth and son. The action taken by Elizabeth is baptized, or the past tense of baptizing her son in the water.

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