Past participles of verbs with '-ar' in the infinitive, e.g.
preocupar, cansar, pesar, acusar, llegar, llamar, empezar (see below for participles as adjectives)
Preceded by the relevant part of the auxiliary verb 'haber' (to have), they form the
Perfect tense, e.g. he acusado (I accused), ha llamado (he/she called), hemos empezado (we began).
They can also be used as adjectives, for example:
Preocupado: Worried
Cansado: Tired
Pesado: Heavy
Acusado: Charged
Llegado: Arrived
Llamado: Called
Empezado: Begun
Libertad and dificultad
yes
estoy cansado means "i am tired" in spanish
Perhaps other Spanish words that end with -ar. cantar
There exist contraction in Spanish, just like they exist in English. Some spanish words though do not include the apostrophe when letters are removed. Any spanish word that ends in "ado" can occasionally have the 'd' removed to make it sound better. This often happens in Spanish reggaeton (a type of spanish rap) to make the song have better rythem. Callao therefore would actually be "callado" which is the spanish word for 'quiet'.
ado undo
Some Spanish words that end in "u" include "menú" (menu), "atún" (tuna), and "virtu" (virtue).
flaco
There are none.
Some examples of Spanish words that end in "ir" are dormir (to sleep), abrir (to open), and vivir (to live).
There aren't any Spanish words that end in K. K is not used in Spanish writing, except in a very few loan words from English and other foreign languages.
Libertad and dificultad
yes
jugo (juice)
estoy cansado means "i am tired" in spanish
bien preparado/educado/ensen~ado
beatice and benedick get married