In Spanish, <u>the verb has to agree with person and number of the subject</u>. So, as in all the sentences of the message the direct subject is the first person singular (I = "<em>yo</em>"), then all verbs have to be conjugated in first person singular, too. Normally, when a verb is regular the way to conjugate it is by adding the suffix -o instead of the infinitive suffix. But, most of the right answer here have <em>irregular verbs</em>, so as they have to follow the rule, also have to change something in the root to be correctly conjugated.
In sentence <u>number 1</u>, Jorge is saying that he RUNS a section of a magazine, which in Spanish is: "dirigir". Now, to conjugate it properly in this case we must add the suffix -o, but also change the last word of the verb's root, because the verb<em> "dirigir"</em> has a strong sound because of the syllable <em>"gi" </em>which has a strong "/j/" sound that goes with a vibration in the pronunciation that the syllable "go" doesn't manifest. So that is why you have to change the word "g" of the root of the verb, for the word <em>"j"</em> instead. Then the verb conjugated goes: <u><em>"dirijo"</em></u>.
In sentence <u>number 2</u>, Jorge is saying that he HAS a dog called Lola. The correct verb in Spanish for this is: "tener". Now, in order to conjugate it correctly we should add the <u>suffix -o</u>, but also add the letter "g" before the suffix as the rule says about the irregular verbs. Then the verb conjugated goes: <u><em>"tengo"</em></u>.
In sentence number 3, Jorge is saying that he doesn't GO OUT so much, and the verb in Spanish for this is: "salir". Now, in order to conjugate it we must follow the same rules as the sentence number 2: add a "g" and then suffix -o. So the verb conjugated goes: <em><u>"salgo"</u></em>.
In sentence number 4, Jorge is saying that he THINKS that Mariana is interesting, and the verb in Spanish for that is: "Creer". Now, this is the only verb that is regular, so to conjugate it we only have to add suffix -o. Then, the verb goes:<u><em> "creo".</em></u>