G A M E The Spanish 'a' and its many uses
I see lots of questions about the Spanish 'a' and why it's needed so I thought that a game might be a good way to learn more about it and give everyone a chance to practice.
How To Play:
Click 'newest'.
Cut and paste the sentences provided by the last player and say why you think the 'a' is needed.
Write your own sentence in Spanish and English for the next person, making sure that the Spanish version includes the word 'a' in any of its many roles.
Feel free to post a pic :D
If you're not sure when to use the preposition 'a' or why it might be needed then this FREE E-BOOK may help.
I'll get us started ...
Given sentences:
Vi a mi mamá.
I saw my mum.
Reason:
The 'a' here is the so-called personal 'a' which is needed when introducing a known person as the direct object of a sentence.
New sentence.
Voy al centro.
I'm going to town.

17 Answers
KiwiGirl´s sentence:
Juan le dio su abrigo a Laura
The a here indicates the recipient of the direct object (abrigo). This would be the same argumente as a indicating the indirect object (Laura).
New sentence:
A que no sabes lo que estoy pensando.
I bet you don´t know what I´m thinking.
Voy al centro. (a + el = al. [to the] This is called the contraction of the article)
= I'm going to town.
The a is used to indicate direction in this sentence. The verb construction: ir a always includes the a. This differs from the personal a used when talking about visiting the house of someone like your grandmother, for example: Fui a visitar a mi abuela, ayer. = I went to visit my grandmother, yesterday. The personal a is used when referring to people or family pets.
New sentence: Quiero aprender a hablar español.
I want to learn to speak Spanish.
Given sentence:
El ñandú pateó al caballo. / The rhea kicked the horse.
Reason:
Now this is an interesting one. Because Spanish sentence order is much more flexible than English the a serves an important role here in that it identifies who is kicking who. The a signals the recipient of the action.
This seems to happen when there are two nouns in one sentence, one being the subject and the other the object.
New Sentence:
Juan le dio su abrigo a Laura.
John gave his coat to Laura.

A orillas del río Piedra me senté y lloré.
The "a" is used to indicate position in Kiwi-Girl's sentence.
New sentence: El ñandú pateó al caballo. / The rhea kicked the horse.
Given sentence: Amo a Italia, su paísajes me encantan.
Reason: Usually, you don't need the ' a' with places, but if you want to stress something, you put the 'a' in, such as ' Siempre he querido visitar a Roma'.
First sentence: Vamos a buscar a un albanil honrado, sea lo que sea. ( We're going o find an honest builder, whatever might happen)
Annie, I hope you don't mind me editing your post and suggesting a different sentence but when you're looking for an unknown person who may or may not exist you won't use the personal 'a'.
Edit ... New Sentence
Conozco a un albañil honrado.
I know an honest builder.
Given Sentence:
Conozco a un albañil honrado.
I know an honest builder.
Reason:
This again is the (so-called) personal 'a' that introduces a known person as the direct object of a sentence.
New Sentence: (a book title)
A orillas del río Piedra me senté y lloré.

Given sentence:
Quiero aprender a hablar español.
I want to learn to speak Spanish.
Reason:
The 'a' in Feliz's sentence is there to connect a verb to a following infinitive. This is not always necessary but is common with verbs that describe the start of an action, the purpose of an action or for verbs that have to do with learning or achieving something.
New Sentence:
Amo a Italia, sus paisajes me encantan.
I love Italy, her landscapes enchant me.
Annie´s sentence:
Toca a ti a pagar. (It's your tun to pay)
"a ti" indicates an indirect object (however, it should be "A ti, te toca pagar" or "te toca pagar")
"a pagar" in this case is not necessary, so just "pagar" without "a".
New sentence - Another "tricky" one:
¿Me puedes cambiar un billete de a veinte? (Can you change me a twenty peso note?)
This might be regional to Mexico and I have no idea why it is spoken this way, but we can also say it without "a" ("un billete de veinte pesos").
Given: ¿Me puedes cambiar un billete de a veinte?
Reason: Well, typical Spanish, I have no idea. I hope Kiwi can illuminate.
New sentence: No tengo a nadie con quien hablar. ( I have nobody to talk to).
Given sentence:
A que no sabes lo que estoy pensando.
I bet you don´t know what I´m thinking.
Reason:
This was a tricky one but as far as I understand this phrase is short for ... 'Apuesto a que ...' I bet that ....
New sentence:
¿Dices que me vio a mí en el teatro?
Are you saying that you saw me in the theatre?

Kiwi, you've forgotten to put up a new one.
I'll do a straightforward one:
New: Pedro, ¿ a que te reffieres?
Update
Given: ¿Me puedes cambiar un billete de a veinte?
Ok, after much investigation it seems that ...
Un billete de veinte means 'a twenty dollar note
whereas
Un billete de a veinte means 'a note worth twenty dollars.
Not a lot of difference but still slightly different ![]()
Given Sentence: No tengo a nadie con que hablar. ( I have nobody to talk to).
Reason: Certain pronouns such as nadie, alguien etc always require the preposition a when they are the direct object of a sentence (the main exception to the rule about known people).
New Sentence:
Le compro un helado a Pablo.
I'm buying an ice-cream from Paul.
Given: ¿Me puedes cambiar un billete de a veinte?
Reason: Well, typical Spanish, I have no idea. I hope Kiwi can illuminate. - Annierats
ja ja! I too am waiting for Kiwi´s illumination - JulianChivi
Well .... I know that the 'a' can be used to express prices (see pg 37 of my book)
eg. Venderá el cerdo a mil bolívares. I will sell the pig for one thousand bolivares.
This isn't exactly the case here so I'm not sure that it's necessary but that is the closest I can come to as a reason for the 'a' in Julian's example.
If anyone can add anything I'd be as interested as the next person jeje
Given: ¿A qué te refieres?
Reason: Here the a simply means 'to' but because Spanish sentences can't end with a preposition 'what are you referring to? must become ¿to what are you referring?.
New Sentence: ¿A que no lo sabes?
