Yo visto
The "yo" form of the verb "conocer" in the present tense is "conozco."
Vestir means "to get dressed", "to clothe" or "to dress". It is a stem changing verb (e to i). For example: yo visto tú vistes él/ella/usted viste nosotros vestimos vosotros vestís ellos/ellas/ustedes visten
The verb "decor" is not a standard verb in Spanish. If you meant "decore" in the present tense, the yo form would be "decore".
It's doy, since dar is an irregular verb, so doy.
Era is the imperfect yo ("I") form of the Spanish verb ser ("to be"). Without the subject pronoun, it may translate as "He was," "It was," "She was" or "You were" according to English contexts. The pronunciation will be "(yo) EY-ra" in Uruguayan Spanish.
"Yo soy" IS conjugated. It is the conjugated form of the verb "Ser"
subject = yo, yo means "I" verb = soy, it's verb to be = am
Conjugation: empecéNote that the "z" in the root changes to a "c" in front of the "e". Because "ze" is not allowed in Spanish, the "z" transitions to a "ce". This is the same with any verb that ends in "zar" in the preterite tense yo form and in the present subjunctive.
There is no first person form of gato. Gato is a noun, not a verb. Nouns are not conjugated.
It is "yo gusto". This verb is more commonly used in the reflexive "gustarse", in which case the verb form refers to the object. Examples: "Yo gusto las chicas" and "Me gustan las chicas" mean the same thing: "I like girls".
A verb. Not any verb will do, though; it must be a verb for which this form (reflexive form) makes sense.
-AR verbs are not a "tense" in Spanish. They are a category of verbs. Anyway, the "yo" form is made by removing the -AR and replacing it with an -O. Therefore HABLAR becomes YO HABLO.