Unlike some other languages English always 'voices' the subject of a sentence. In some other languages the subject does not need to be said because the verb form is exclusive to that particular subject. In English the verb form is often the same whoever the subject is. So we must state the subject. The subject can be a noun or a subject pronoun (I, he, she, it, we, you, they). If the subject is a noun we don't use a pronoun as well. So 'Maria is Italian' or 'She is Italian'. Not Maria she is Italian. 'To be' can be the main verb in a sentence or the auxiliary verb in tenses such as the continuous tenses and the passive. The noun or pronoun which denotes the subject always goes infront of the verb in the negative and positive forms and after in question forms. I am late, I am not late.. Am I late?

No, not always. English has exceptions to almost, if not all, rules. Your question is vague, but here are some examples for you. "I am the one who studies languages." 'The one' is a special pronoun and comes after the verb to be. "It's you!" The pronoun comes after the verb. "I am familiar with her." The adjective 'familiar' breaks the verb away from the pronoun. To reconnect them, the preposition 'with' is needed. "She was happy to meet him." Same thing; the adjective breaks apart the verb and pronoun. Then another preposition 'to' and the verb 'meet' reconnect them. Some may think that 'to meet' is an infinitive, but it isn't here. English is based off of German and Latin, both of which use 'to' + a verb to modify a noun or adjective like 'happy'. In such cases, 'to' is a preposition in all three languages.

"Do pronouns always come with the verb 'to be'?" No, they do not. You see the verb 'to be' with pronouns because many situations use the present continuous tense (something that is done now) "I am reading" (I read now) "I am studying." (I study now) If the past tense is used, then 'to be' would not be used: "I ran yesterday." "He went an hour ago".

Give us the example/situation so we can help you.