1. Right answer:
está practicando
The present progressive, also called the present continuous tense, is used when talking about actions that are happening now. This tense is often formed with the verb estar plus the present participle.
So Spanish present participles end in ndo (equivalent of the English ending ing)
So está is the conjugation of the verb estar for the third person singular in the simple present and participando (participating) comes from the verb participar (to participate)
2. Right answer:
estoy escondiendo
As we said above, the present progressive is often formed with the verb estar plus the present participle, that is:
estar + present participle
In this way, estoy is the conjugation of the verb estar for the first person singular in the simple present. So the verb that comes after this verb needs to be in the present progressive, that is, ending in ndo. That's the case of escondiendo (hiding) that comes from esconder (to hide).
3. Right answer:
estamos escribiendo
nosotros is the subject pronoun for the first person plural, which is we in English. So the conjugation of the verb estar that matches the first person plural is estamos. On the other hand, the verb that comes after this verb needs to be in the present progressive, that is, ending in ndo. That's the case of escribiendo (writing) that comes from escribir (to write).
4. Right answer:
Incorrect
This sentence is incorrect because of the word manana. The correct word is mañana that translates into tomorrow. So this word stands with the letter ñ, which is the fifteenth letter of the Spanish alphabet whose name is eñe. The rest of the sentence is correct. For instance, tengo is the conjugation of the verb tener in the simple present and trabajar is a verb given in infinitive form.
5. Right answer:
vendo
Vendo is the conjugation of the verb vender (to sell) for the first person singular (yo - I in English) in the simple present. The simple present tense is used to talk about habitual actions or routines. This tense is also used to describe things that happen now or in the near future. So in this sentence I am saying that is a routine to sell at least ten dresses per day.
6. Right answer:
contesto
Contesto is the conjugation of the verb contestar (to answer) for the first person singular in the simple present. Siempre is an adverb that translates into always and means at all times, on all occasions. So this means that is a routine to answer questions, that is, I always answer all the questions.
7. Right answer:
Incorrect
Why is this sentence incorrect? The word esta doesn't have an accent mark. The correct word is está. This word represents the conjugation of the verb estar for the third person singular in the simple present. The rest of the sentence is correct. So the correct sentence would be:
El cuarto de mi hermanito hoy está limpio, generalmente está un poco sucio.