Esta frase es gramaticamente correcta: 1. yo estoy nado.
true or false?
2. nosotros estamos nadandos.
true or false?
3. ellos estaban hablando.
true or false
4.yo fui a madrid todos los anos
true or false?
5.el estudio cuando yo entraba.
true or false?
6.el ano pasado, yo fui a espana.
true or false?
este pais es muy delgadito y toca el mar caribe y el oceano atlantico. usa el dolar para su moneda
a. mexico
b. chile
c. panama
7. este pais es el unico pais hispanohablante en europa.
a. estados unidos
b. espana
c. argentina

Yo estoy nado

The word nado is incorrect because doesn't represent the conjugation of any verb. Basically, this word does not exist. The word yo is correct and is the subject pronoun for the first person singular. On the other hand, the word estoy comes from the verb estar and is correct, matching the same first person singular. Finally, the correct sentence is:

Yo estoy nadando (I'm swimming)

Nosotros estamos nadandos

The word nadandos is incorrect because doesn't exist. The word nosotros is correct and is the subject pronoun for the first person plural. On the other hand, the word estamos comes from the verb estar and is correct, matching the same first person plural. Finally, the correct sentence is:

Nosotros estamos nadando (We're swimming)

Ellos estaban hablando

This sentence is correct. The word estaban comes from the verb estar matching the third person plural in the imperfect tense. The imperfect is used to talk about past actions, conditions, or events that occurred regularly or frequently or that were in progress in a moment in the past. So the translation of this sentence is:

They were talking

Yo fui a Madrid todos los anos

This sentence doesn't make sense because of todos los anos. Let me explain, the word fui is the conjugation of the verb ir for the first person singular in the preterite tense. This tense is used to describe actions that took place or were completed at a certain point in the past. That is, I went to Madrid. Todos los años means every year, since the preterite tense is used when making something at a certain point in the past, you need to say something like this:

Yo fui a Madrid el año pasado (I went to Madrid last year)

El estudio cuando yo entraba

This sentence is incorrect because of the word estudio. The correct word is estudió. Don't forget to add accent mark when required in Spanish words. An accent mark can give a different meaning in a sentence. To make this sentence correct, you just need to replace estudio for estudió in the sentence. Therefore:

El estudió cuando yo entraba

El ano pasado, yo fui a Espana.

This sentence is incorrect because of the word ano. The correct word is año. Recall that in Spanish we have a letter ñ which is not part of the English alphabet. So the word año means year, The word ano has other meaning. Thus, the correct sentence is:

El año pasado, yo fui a Espana. (The last year I went to Spain)

Spain (España), officially the Kingdom of Spain (Reino de España) is a country mostly located on the Iberian Peninsula in Europe. Its Official language  and national language is Spanish. It also has other Co-official languages  in certain autonomous communities, that are Catalan, Galician, Basque  and Occitan. This is the only Spanish speaking country in Europe.

Officially the Republic of Panama, is a country located in central America. This country is bordered by Costa Rica to the west, Colombia to the southeast, the Caribbean Sea to the north and the Pacific Ocean to the south. The location of this country is strategic. This country has a total area of 75,417km² and there's an important canal called Panama Canal which connects the Atlantic Ocean and the Caribbean Sea to the North of the Pacific Ocean.