Answers and explanation:
In the exercise that we’re asked to complete we have a special kind of sentences in Spanish: <em>CONDITIONAL SENTENCES</em>. But what are those?
<h2>CONDITIONAL SENTENCES</h2>
They are those sentences that <u>express an action that only can be possible if a condition or requirement is previously satisfied.</u> So, in conditional sentences, we always are having a CONDITION and a CONSEQUENCE.
EXAMPLE:
<em>Si comes mucho serás gordo</em> (If you eat a lot you will be fat)
- CAUSE: Comer mucho (eat a lot)
CONSEQUENCE: Ser gordo (be fat)
<h2>GRAMMAR</h2>
as we can see, in conditional sentences we always are having a special word (conjunction) that indicates the conditional feature of the sentence. This word is <em>SI</em> and it works as the English word <em>IF</em>.
We also can conjugate the verbs in all the moods, tenses, voices and numbers that we want, we just have to recognize the syntactical structure:
<h3>SI + SIMPLE SENTENCE (in any verbal conjugation) + COMMA + SIMPLE SENTENCE (in any verbal conjugation)</h3>
<em> *Please notice how we can select any conjugation form, but it exists a relation between the two conjugated verbs*</em>
<h2>ANSWERS</h2>
<em>INDICATIVE MOOD</em>
1. Si usted VA a la playa, tenga cuidado con el sol
2. Si tú QUIERES, te preparo la merienda
3. Si HACE buen tiempo, voy a ir al parque
4. Si mis amigos IBAN de viaje, sacaban muchas fotos
<em>SUBJUNCTIVE MOOD
</em>
5. Si ella me LLAMARA, yo la invitaría a la fiesta
6. Si nosotros QUISIÉRAMOS ir al teatro, compraríamos los boletos antes
7. Si tú te LEVANTARAS temprano, desayunarías antes de ir a clase
8. Si ellos TUVIERAN tiempo, te llamarían
9. Si yo FUERA astronauta, habría ido a la luna
10. Si él GANARA un millón de dólares, habría comprado una mansión
<em>*EXTRA* </em><em>SUBJUNCTIVE MOOD + COMPUND VERB </em>
11. Si ustedes me HUBIERAN DICHO la verdad, no habríamos tenido este problema
12. Si ellos HUBIESEN TRABAJADO más, habrían tenido más éxito.