Answer:
Teresa y yo <em>estudiamos</em> en la Universidad Autónoma de Madrid. Teresa <em>estudia</em> lenguas extranjeras. Ella <em>desea</em> trabajar en las Naciones Unidas. Yo <em>tomo</em> clases de periodismo. También me gusta <em>cantar</em> y <em>bailar</em>. Los sábados <em>canto</em> con una tuna. Una tuna es una orquesta estudiantil. Los jóvenes de la tuna <em>caminan</em> por las calles y <em>cantan</em> canciones tradicionales de España.
Explanation:
1. Teresa and I study at the Autonomous University of Madrid.
The verb you should use here is <em>estudiar </em>which means <em>to study. </em>It belongs in the first group of regular Spanish verbs ending in -AR. It does not need a direct object neither in Spanish nor in English. In this sentence the subject is plural, <em>Teresa y yo,</em> and you should choose the form for <em>nosotros</em>.
2. Teresa studies foreign languages.
In the second sentence we have the same verb, <em>estudiar</em>, in the same verbal form of the <em>presente del indicativo</em>, only this time accompanied by a direct object: what does she study? <em>lenguas extranjeras.</em> The subject here is Teresa, and takes the form of the third person singular: <em>ella. </em>
3. She <em>wants</em> to work in the United Nations.
The verb we have in the third sentence is <em>desear, </em>which means<em> to wish, to want. </em>Just like <em>estudiar</em>, it is part of the group of verbs in -AR and conjugates regularly. When we talk about what we want <em>to do</em>, we use the structure <em>desear</em> + <em>infinitive</em> <em>form</em>, for example: deseo cantar.
4, I <em>take</em> journalism classes.
This sentence introduces the verb <em>tomar </em>which means <em>to take </em>as in to take classes, but we can also use it as the Spanish equivalent of the verb <em>to drink:</em> tomar un café. It demands a direct object (here <em>clases de periodismo</em>) and in this particual case we must use the first person singular form: yo tomo.
5. I like to sing and dance, too.
In this fifth sentence we have a special form that expresses likes/dislikes in Spanish. It is the verb <em>gustar</em> which only has the form of third person singular and plural. We use a pronoun in order to indicate who is it that likes this. It is conjugated as follows:
(a mí) ME gustA/gustAN... (a nosotros) NOS gustA/gustAN...
(a ti) TE gustA/gustAN... (a vosotros) OS gustA/gustAN...
(a él) LE gustA/gustAN... (a ellos) LES gustA/gustAN...
If we talk about what we like to do, we use the structure <em>me/te/le/nos/os/les </em><em>gusta + infinitive. </em>and that is why we put <em>me gusta </em>CANTAR y BAILAR.
6. On Saturdays I <em>sing</em> with a <em>tuna</em>. It is a student music group.
In this sentence we used the verb <em>cantar</em> which means <em>to sing</em>. Here it is used without a direct object. It is a regular verb in the first person singular of the present tense and expresses a repeated action, such as a scheduled music group event.
7. The youth from the music group <em>walk</em> through the streets and <em>sing</em> Spanish traditional songs.
The new verb we have here is <em>caminar </em>meaning <em>to walk</em>. Just as the rest of the verbs it belongs to the regular -AR group. The subject of both of the verbs in this sentence is <em>los jóvenes </em>which is plural in Spanish and takes the form of the third person plural - <em>ellos.</em>
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Here's how to conjugate the -AR group:
yo CANT-O nosotros CANT-AMOS
tú CANT-AS vosotros CANT-ÁIS
él CANT-A ellos CANT-AN
Happy learning!