Rubén cree que la lección 3 es fácil. (ellos) question 2 with 1 blankmis hermanos aprenden alemán en la universidad. (mi tía) question 3 with 1 blankaprendemos a hablar, leer y escribir en la clase de español. (yo) question 4 with 1 blanksandra escribe en su diario todos los días (every day). (tú) question 5 with 1 blankcomparto mis problemas con mis padres. (víctor) question 6 with 1 blankvives en una residencia interesante y bonita. (nosotras)

Explanation:

1.Rubén cree que la lección 3 es fácil.

Ruben believes that lesson number three is easy.

The verb is creer, it's in third person singular form, in present tense.

It means to believe.

This verb is a regular verb, it ends in ER and it belongs to the second group of verbs.

2.Ellos creen que la lección 3 es fácil.

They believe that lesson number three is easy.

The verb we have here is also creer, it's in the third person plural form, in the present tense. It means to believe.

It's a regular verb that belongs to the second group of verbs and it ends in ER.

3.Mis hermanos aprenden alemán en la universidad.

My sisters learn German at college.

The verb we have here is aprender and it means to study.

It's a regular verb and it belongs to the second group.

It's in a third person plural form, in the present tense.

4.Mi tía aprende alemán en la universidad.

My aunt learns German at college.

The verb we have here is also aprender, which means to study.

It's in the third person singular form, in the present tense.

This verb belongs to the second group of verbs as it ends in ER and it's a regular verb.

5.Aprendemos a hablar, leer y escribir en la clase de español.

We learn to talk, read and write in Spanish class.

The same verb like in previous two sentences.

It's a verb in Spanish language that means to learn.

It's in the first person plural form, in the present tense.

This verb is a regular verb ending in ER and it belongs to the second group of verbs.

6.Yo aprendo a hablar, leer y escribir  en la clase de español.

I learn to talk, read and write in Spanish class.

The same verb we used in the sentence 3,4,5.

A regular verb in Spanish language that belongs to the second group because it ends in ER. It's a regular verb.

In this sentence, the verb aprender is in the first person singular form, in the present tense.

7.Sandra escribe en su diario todos los días (every day).

Sandra writes in her diary every day.

The verb we have here is ESCRIBIR, and it means to write.

It's a verb that belongs to the third group of verbs, with IR ending.

It's an irregular verb.

In this case, the verb we have is in the third person singular form and it's in the present tense.

8.Tu escribes en tu diario todos los días.

You write in your dairy every day.

The verb we have here is also ESCRIBIR.

An irregular verb in Spanish language that means to write.

It ends in IR, which makes it a participant in the third group of verbs, and in this sentence it's in the second person singular form, in the present tense.

9.Comparto mis problemas con mis padres.

I share my problems with my parents.

The verb we used here is COMPARTIR, to share.

It's a verb in Spanish language that also belongs to the third group of verbs as it ends in IR. It's an irregular verb.

In this case, the verb we have is in the first person singular form, in the present tense.

10.Victor comparte sus problemas con sus padres.

Victor shares his problems with his parents.

The same verb we used in the previous sentence.

COMPARTIR -- to share.

Belongs to the third group, ends in IR. Irregular verb.

In this sentence, we have the verb compartir in the third person singular form.

The tense we have here is -- present.

11.Vives en una residencia interesante y bonita.

You live in an interesting and beautiful home.

The verb we have here is VIVIR.

In Spanish language the verb vivir means to live.

The verb belongs to the third group of verbs, because it ends in IR.

It's a regular verb.

The tense we have here is present, and the form is second person singular.

12.Vivimos en una residencia interesante y bonita.

We live in an interesting and beautiful home.

Like a previous sentence, we have a verb VIVIR.

It means to live when translated to English, and it's a regular verb with IR ending, making it a third group of verbs participant.

The verb we have here is in the first person plural form and it's in the present tense.

c. encontramos

explanation:

if i am wrong i am sorry : )