Hello, I'm a Spanish speaker and would like to help you. All the verbs are in Present Tense Form. In Spanish, the simple present tense (el presente or el presente de indicativo) is used to talk about habitual actions, routines, things happening now or in the near future, universal truths, facts, hypotheticals, lapses of time, and for ordering in restaurants and stores. There are both regular and irregular indicative forms.
Regular forms: In Spanish, you can recognize some endings for regular verbs, one for <em>ar</em> verbs, one for <em>er</em> verbs and one for<em> ir</em> verbs. Thus, if you want to conjugate an <em>ar</em> verb, take away the infinitive ending<em> ar</em> and add the ending that matches the subject. On the other hand, if you want to conjugate an <em>er</em> verb, remove the infinitive ending <em>er</em> and add the ending that matches the subject. Finally, to conjugate an <em>ir</em> verb, take away the infinitive ending<em> ir</em> and add the ending that matches the subject.
Irregular forms: There are some changes when using the present tense yo conjugations, so these changes build up the irregular form. In this way, verbs ending in <em>guir, ger, </em>or <em>gir </em>undergo a spelling change in their present tense <em>yo</em> forms. First, for verbs ending in <em>guir</em>, the<em> yo</em> form ends in <em>go</em>. Second, for verbs ending in <em>ger</em> or <em>gir</em>, the <em>g</em> in the <em>yo </em>form changes to a <em>j.</em> On the other hand, there are some exceptions regarding <em>ar, er</em> and <em>ir</em> verbs, so there are some of these types of verbs that have an irregular form.
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So, solving this problem we have:
1. Tú miras la pizarra.
<u>Verb:</u> Mirar
<u>Conjugation:</u> Miras (Matching the second-person singular)
2. Ustedes estudian en la biblioteca.
<u>Verb:</u> Estudiar
<u>Conjugation:</u> Estudian (Matching the second-person plural)
3. ¿Por qué habla Juan Miguel por teléfono?
<u>Verb:</u> Hablar
<u>Conjugation:</u> Habla (Matching the third-person singular - Male)
4. ¿Quién participa en las actividades?
When asking <em>who </em>does something the verb goes after <em>quién </em>and its conjugation fits the third-person singular. In this case, participa.
5. ¿Trabajas tú por la tarde?
<u>Verb:</u> Trabajar
<u>Conjugation:</u> Trabajas (Matching the second-person singular)
6. El compañero practica fútbol.
<u>Verb:</u> Practicar
<u>Conjugation:</u> Practica (Matching the third-person singular - Male)
7. Ana y Susana participan en la clase de ciencias.
<u>Verb:</u> Participar
<u>Conjugation:</u> Participan (Matching the third-person plural)
8. Ustedes hablan con mi amiga Elena.
<u>Verb:</u> Hablar
<u>Conjugation:</u> Hablan (Matching the second-person plural)
9. Alejandro estudia para el examen.
<u>Verb:</u> Estudiar
<u>Conjugation:</u> Estudia (Matching the third-person singular - Male)
10. Patricia y yo escuchamos a la maestra de inglés.
<u>Verb:</u> Escuchar
<u>Conjugation:</u> Escuchamos (Matching the first-person plural)
