Answer:
Direct object pronouns are pronouns that represent the nouns that are directly acted upon by the verb. Indirect object pronouns stand for the noun that is the recipient of the verb's action.
As for formal VS informal, usted is the keyword. Whereas in english language being formal/polite has to do with the use of certain words, using usted (you) in spanish changes verbs in the sentence and makes the communication formal. Tú (you) is used informally. Usted is usually used for elders or those in higher up positions, like a teacher. Tú is usually used for friends.
Un carro es el mejor. El tren es peligroso porque las personas raras. El autobus es tan peligroso. La bicleta es divertido pero agotador. Ten cuidado.
Answer:
How do socioeconomic conditions influence citizens' access to health services?
Explanation:
I know English, Russian, Greek and Spanish
Answer:
You only use the verb haber in the 'hay' form and never conjugate it into other forms. It stays the same with plural and singular nouns.