"Are you ready?"
Translation:Tu es prête ?
I would add that the masc./fem. differentiation is based on the person you are addressing; if they are male, use prêt and if they are female, use prête. Use masculine terms when referring to mixed groups and femine when referring to a group of exclusively women. Hope that helped a little!
Listen for the "T""
If you are asking someone if they are ready - When you ask a man or boy if they are ready you would say "Tu est prêt ?". Note there is no e on the end of the word so you do not pronounce the t.
When you ask a girl or woman you would say ''Tu est prête ?" When there is an e on the end of the word you pronounce the T.
So the key in this sentence is to listen for a ''T'' in prête. If you hear a ''T'' then prête is feminine. If you don''t hear the ''T'' then prêt is masculine.
Many adjectives are made feminine simply by adding an ''e'' at the end of the word. When this happens the consonant preceeding the ''e'' is pronounced.
On 5/23/19, no audio accompanied this question. DL accepted my answer "Vous êtes prêts."
However, with NO audio, ALL of the answers below should also be accepted by DL as a correct written translation of “Are you ready?” because: (1) “you” can refer to both singular and plural and (2) one cannot listen for an audible "t" in prête / prêtes, which would indicate that the question is being addressed to a woman (or more than one woman).
"Tu es prêt" -- addressing a man
"Tu es prête -- addressing a woman
"Vous êtes prêt" -- addressing a man
"Vous êtes prête -- addressing a woman
PLURAL, INFORMAL AND FORMAL
"Vous êtes prêts -- addressing men or mixed (women and men)
"Vous êtes prêtes" -- addressing only women
In French verbes are conjugated with regards to a person's perspective (1. 2. or 3. person), as well as singular/plural, tenses, etc.
In this case the conjugation ("bending") of the verb être (present tense) is as follows:
SINGILAR 1. Je suis 2. Tu es 3. Il/elle/on est PLURAL 1. Nous sommes 2. Vous êtes 3. Ils/elles sont
"prêtes" is feminine plural, but "es-tu" is asking a single person. Correct would be any of the following:
"Es-tu prêt" or "Es-tu prête" asking a single male person (1st) or single female person (2nd) informally
"Êtes-vous prêt" or "Êtes-vous prête" asking a single male person (1st) or a single female person (2nd) formally
"Êtes-vous prêts" or "Êtes-vous prêtes" asking multiple male people or male/female mixed people (1st) or multiple all-female people (2nd)
It looks correct to me. Sometimes the computer doesn't have all the correct answers. I assume you had accents marks, although duo rarely marks you wrong if you leave them out. According to two very good descriptions above, your example is one of the correct translations: 2nd person formal.
The verb is...etes = are. Pretes or prete or pret (sorry I don't have accents) are all forms of an adjective meaning 'ready'. It is NOT a verb. It only needs to agree in gender and number. Duo gave you the feminine plural, which could be true if the group (vous = you) is all female.