That is simply not correct. The only type of cards that would use the Spanish word carta are playing cards or tarot cards. Postcard is tarjeta postal, or just postal. Greeting cards of all types are tarjetas, with or without their occasion name (tarjeta de Navidad, compleaños, felicitaciones, etc), Business cards have a few names Tarjeta de visita, tarjeta de presentación, or tarjeta de negocio. Credit/debit cards are tarjetas de crédito/débito. And in my four years on Duo, I have never once seen them incorrectly accept carta for card. While it is theoretically possible that someone is sending a playing or credit card, accepting that as an answer would be deceptive as it would suggest that card is a complete cognate for carta.. Duo is far from perfect, but I suggest you keep a good dictionary close, either online or hard copy, to help you clarify the meanings of the words as it is difficult for Duo to provide the true extent of the possible meanings for a word in all contexts. Carta means more than just letter. It can mean menu, map/nautical chart etc But the only card it refers to comes in a deck.
People say, "email," or, "correo electrónico." Email address is, "dirección de correo electrónico."
I have seen sentences used on duolingo where carta means letter. Ex: ella escribe la catra So I don't know why it would mark it wrong here.
I don't think it was marked wrong (for that reason anyways...) as "carta" does mean "letter".....maybe it was marked wrong for a different reason ( or maybe DL had a glitch. that day....).
Map is mapa most commonly. While carta means map I think that they use it for nautical maps which we often call charts. While it might be potentially reportable, I think for these contextless sentences it is better for Duo to accept the more generic answers only when others might be confusing.
Carta means letter. It can also mean card, but not the type of card that you associate with letter in English. Carta means. playing card. Both postcards/greeting cards and credit/debit cards use the word tarjeta. It is important to remember that because to some extent Carta is a false cognate.
Ohhh, okay! Sweet, thanks! That does seem like a weird inconsitency though, as carta does mean letter.
It only seems inconsistent because Carta looks like a cognate of card. But our word for card is not related to our word for letter. But if you look at the other uses of the word Carta in Spanish it would suggest that the core meaning of carta is something other than correspondence per se. You also use carta for a menu, a map or nautical chart, or a charter (like the Latin Magna Carta)
There is no indirect object, therefore no indirect object pronoun. Ellas is the subject, van a recibir the verb phrase and mi carta is the direct object, that is the thing that is received. If the sentence were I am going to send them a letter, then you would have both a direct and indirect object, although no direct object pronoun. Le voy a enviar una carta. You would still use the indirect object pronoun even if you specified whom the letter was being sent to. Le voy a enviar una carta a Maria. If you want to just say it, you would use both and indirect and a direct object pronoun. Since the direct object pronoun also begins with an l, the le changes to se. This can make it look either reflexive or se passive if you aren't paying attention. Se la voy a enviar a Maria. This is something Duo doesn't teach, at least I don't remember ever seeing two object pronouns except maybe in the imperative like démelo. But if you are really going to be communicating in Spanish you should learn it. Of course since the verb phrase contains an infinitive, which is one of the three forms which can accept attached object pronouns, any of these could attach the pronoun to the infinitive. In the case of the last example that would be Voy a enviársela a Maria. Note that in both the imperative and the infinitive adding two object pronouns will always require an accent to keep the stress on the appropriate syllable.
No. No Hallmark cards would use tarjeta either specific like Tarjeta de cumpleaños or a more generic Tarjeta de felicitación which is like greeting card
Tarjeta is also used for postcards, credit card and most other types of cards. Only playing or tarot cards use carta.