<h2>1. Right answer: bailarín (B)</h2>
In Spanish (Castilian) there are <u>three genders for nouns</u>: male, female and neutral. Except in the case of people and animals, the grammar gender is only a convention that indicates the article and the ending of the adjective that are used with a specific name.
Now, bailarín (dancer) is a <u>singular masculine noun</u> and <u>its feminine</u> form is bailarina. Therefore the word bailarín <u>cannot be used for both genres</u>.
Nevertheless, the nouns cantante (singer), atleta (athlete) and joven (young) are <u>neutra</u>l and can be used for both genres in Spanish.
<h2>2. Right answer: to say that you know how to play the piano (D)</h2>
The verb <em>“to know” </em>has two principal meanings in Spanish:
“saber” or “conocer”
<h2><u>
Saber </u></h2>
-It is used to indicate knowledge of a fact.
-It is used when we want to express the ability to do something or talk about knowing skills (also learned skills). For example: driving or playing piano; writing the verb in the following form:
<h2>saber+ verb in infinitive
</h2>
Note that often the verb saber is followed by the words cómo (how), que (that), qué (what), quién (who), dónde (where), cuándo (when), cuál (which), por qué (why).
<h2><u>
Conocer
</u></h2>
- It is used when we have had some experience with a known thing or a known person or to indicate that you have a relationship with a person.
-It is also used to say that we have been or visited a place.
-It may also mean "to meet" a place, a thing or a person (for the first time).
Now, in this sentence we are talking about a <u>skill</u>: to play piano, therefore we must use <em>saber</em>:
<h2>
Yo <u>sé</u> <em>cómo</em> tocar el piano
</h2>
I <u>know</u> <em>how</em> to play the piano
The other sentences match with conocer:
-If you want to say that you know San Salvador (that you have been or visited a place) the correct translation is:
Yo <u>conozco</u> San Salvador
-If you want to say that you know Maria (that you have a relationship with a person) the correct translation is:
Yo <u>conozco</u> a María
-If you want to say that you have met your friend's mother (that you have met a person for the first time), the correct translation is:
Yo he <u>conocido</u> a los amigos de mi madre