[11] a fin de, to the end that. VARIANTS: A efecto de; con el objeto de.
[12] hay que, must. The various tenses of haber used impersonally, followed by que with an infinitive, express obligation or necessity.
[13] ¿Qué pasos hay que dar para...? What steps must be taken to...? VARIANTS: ¿Qué debe hacerse para...? ¿Qué cosas son necesarias para (or a fin de or con el objeto de) ...? ¿Qué pasos habría que dar...? Note that in the last variant the conditional tense is used.
[14] Ante todo, First of all. VARIANTS: En primer lugar; primeramente.
[15] Note that the third person, singular or plural, of the reflexive is employed. The reflexive pronoun se is the real object of the verb.
[16] Tanto la casa como, Both the house and. VARIANT: La casa, lo mismo que (as well as) el terreno.
[17] Note that abonados is in the masculine form. See 15.
[18] por mensualidades, in monthly instalments. VARIANTS: A plazos, in instalments; por cuotas mensuales, by monthly payments.
[19] Equivalent to no pueden ser construidos; note that in one case the verb poder is in the singular number while in the other case it is in the plural. See 15.
[20] con la ayuda de, with the help of. VARIANTS: Por medio de; mediante; por conducto de.