Subjunctive, infinitive, or indicative???

can anyone please correct me??? I try to practice it before my test but I'm really confused about it, and also please explain why I did it wrong??? muchas gracias!!!!

Put ir in the nosotros subjunctive form
vayamos
Put haber in the singular subjunctive form
haya
Mi madre ruega que mis hermanos no (dormir) hasta el mediodía los sábados.
duermen
Elena ruega que alguien (recoger) la basura en el barrio
recoge
Pienso que María (ver) la película nueva.
ve
Es posible que no (ir) a llover hoy.
tú vayas
Es importante que Uds. (reciclar).
reciclen
Rogelio me dice que su primo (ser) muy guapo.
es
Put ser in the tú subjunctive form
seas
Ella duda que ellos (jugar) el partido.
jueguen
Me alegro de que mis padres (pagar) por el carro nuevo.
paguen
Ojalá que el concierto no (ser) muy largo.
sea
Recomendamos que ella (oir) el radio.
oiga
Es obvio que nosotros (saber) la respuesta.
sabemos
Es importante (reciclar).
reciclar
No es dudoso que la familia (ir) a México la próxima semana.
va
Put estar in the ellos subjunctive form
estén
Espero que todo el grupo (divertirse) a la fiesta.
se divierta
Es posible que ella y yo (saber) como jugar.
sepamos
Yo creo que ella (almorzar) con mi amigo.
almuerza
Es triste que yo no (conocer) el lugar.
conozca
Sabemos que la señora Guillén (ser) una buena profesora.
es
Put dar in the yo subjunctive form

Quiero un amigo que no me (mentir).
miento
Es importante que Uds (tocar) el piano.
toquen

Mi madre ruega que mis hermanos no (dormir) hasta el mediodía los sábados.

duermen = the Subjunctive is required here = duerman

Let's look at the reasons for the Subjunctive in the first place. You must analyze the main verb and if you can classify it as:
1. imposition of will (someone wants, suggests, begs, etc. that someone else do something does not imply that it will become fact)(this includes impersonal expressions also like es importante, es bueno, es mejor, etc.)

2. emotion (one person is glad, sad, upset, etc. about another person)

3. doubt, disbelief, denial (including creer, pensar, verdad, cierto used neegatively or interrogatively) about something

Each time you analyze a main verb, classify it as either l, 2, or 3. The example above is 1 (beg = imposition of will)

Elena ruega que alguien (recoger) = same type as #1 (recoja)

Es importante (reciclar).
reciclar = correct! Only one subject so infinitive.

Quiero un amigo que no me (mentir).
miento = it IS subjunctive because it's an indefinite antecedent. This is what I WANT but it may not even exist. the Subjunctive here is mienta.

You got everything else! ¡Olé! Try to imagine a crystal ball. If you can see in it that it DID happen, IS happenING, WILL happen, etc. it is the Indicative. BUT if that crystal ball is "cloudy" meaning you never know for SURE, then it is Subjunctive.

Please feel free to ask any other questions you may have. This is one of my favorite things to teach; I cann the Subjunctive "the thinking person's tense."

Sra

The correct answers are:

Put ir in the nosotros subjunctive form: vayamos
Put haber in the singular subjunctive form: haya
Mi madre ruega que mis hermanos no (dormir) hasta el mediodía los sábados. - Incorrect: duermen
Explanation: The correct form in the subjunctive would be "duerman" since we are expressing doubt or uncertainty about the action of sleeping.

Elena ruega que alguien (recoger) la basura en el barrio. - Incorrect: recoge
Explanation: The correct form in the subjunctive would be "recoja" since we are expressing a request or desire for someone to pick up the trash.

Pienso que María (ver) la película nueva. - Incorrect: ve
Explanation: The correct form is "vea" since we are expressing doubt or uncertainty about whether or not Maria will see the new movie.

Es posible que no (ir) a llover hoy. - Incorrect: tú vayas
Explanation: The correct form is "vaya" since we are expressing possibility or uncertainty about whether or not it will rain today.

Es importante que Uds. (reciclar). - Incorrect: reciclen
Explanation: The correct form is "reciclen" since we are expressing the importance of recycling.

Rogelio me dice que su primo (ser) muy guapo. - Incorrect: es
Explanation: The correct form in the subjunctive would be "sea" since Rogelio is expressing doubt or uncertainty about whether or not his cousin is very handsome.

Put ser in the tú subjunctive form: seas

Ella duda que ellos (jugar) el partido. - Incorrect: jueguen
Explanation: The correct form in the indicative would be "juegan" since Ella is expressing doubt or uncertainty about whether or not they play the game.

Me alegro de que mis padres (pagar) por el carro nuevo. - Incorrect: paguen
Explanation: The correct form in the indicative would be "pagan" since we are expressing joy or happiness about the fact that my parents pay for the new car.

Ojalá que el concierto no (ser) muy largo. - Incorrect: sea
Explanation: The correct form is "sea" since "ojalá" expresses a wish or hope, and we are uncertain about the length of the concert.

Recomendamos que ella (oir) el radio. - Incorrect: oiga
Explanation: The correct form in the subjunctive would be "oiga" since we are giving a recommendation or suggestion.

Es obvio que nosotros (saber) la respuesta. - Incorrect: sabemos
Explanation: The correct form in the indicative would be "sabemos" since we are stating a fact that it is obvious that we know the answer.

Es importante (reciclar). - Correct

No es dudoso que la familia (ir) a México la próxima semana. - Incorrect: va
Explanation: The correct form in the subjunctive would be "vaya" since we are expressing certainty or non-doubt about the fact that the family is going to Mexico next week.

Put estar in the ellos subjunctive form: estén

Espero que todo el grupo (divertirse) a la fiesta. - Incorrect: se divierta
Explanation: The correct form in the subjunctive would be "se divierta" since we are expressing hope or expectation that the whole group will have fun at the party.

Es posible que ella y yo (saber) cómo jugar. - Incorrect: sepamos
Explanation: The correct form in the subjunctive would be "sepamos" since we are expressing possibility or uncertainty about whether or not she and I know how to play.

Yo creo que ella (almorzar) con mi amigo. - Incorrect: almuerza
Explanation: The correct form in the indicative would be "almuerza" since I believe that she has lunch with my friend.

Es triste que yo no (conocer) el lugar. - Incorrect: conozca
Explanation: The correct form in the subjunctive would be "conozca" since we are expressing sadness or regret that I do not know the place.

Sabemos que la señora Guillén (ser) una buena profesora. - Incorrect: es
Explanation: The correct form in the indicative would be "es" since we are stating a fact that we know Mrs. Guillén is a good teacher.

Put dar in the yo subjunctive form: dé

Quiero un amigo que no me (mentir). - Incorrect: miento
Explanation: The correct form in the subjunctive would be "mienta" since we are expressing desire or preference for a friend who does not lie.

Es importante que Uds. (tocar) el piano. - Incorrect: toquen
Explanation: The correct form in the indicative would be "tocan" since it is important that you play the piano.

I hope this helps! Good luck with your test!