<<For example, pe - do is the word pero or but.
Is incluiria.... In - clue - ear - e -a
and is retiraria.... RR - et - e - da - d -a >>
Yeah it's not exactly a 'd', however let me tell you that some children tend to pronounce it like a 'd' or even omit it completely in early stages of their language learning. I'd say it's fairly difficult to pronounce the 'r' and 'rr' sounds because the tongue requires some strength that children don't have. But here's my answer to the question.
r .- is an alveolar tap, pronounced similarly to the flapped sound of intervocalic 't' and 'd'. It's used between vowels, at the end of most words, especially verbs, and in consonant clusters before or after other letters, but it depends on the accent.
It's like the the tipped sounds of the 'r' that can be heard in some Scottish accents, or in ultra posh English accents, in the word 'very'.
Eg:
r - ere
pero
trabajar*
arco
puerto
arbol
rr.- A bit difficult for children to master, when they can't pronounce it they're teased because of speaking with a "French" flair. And very difficult for English speakers as well, who usually fail and use their normal 'r' sound, which gets quite difficult to understand when they have some non-rothic accent. We make people practice on this by telling them to imitate the growling of a dog saying the 'rrrrrrrrrrrrrrrrrrr' sound, with a special emphasis in the vibrating quality of this sound.
It's used when you see double 'r', that's 'rr'. And also, as a allophone of 'r' in word initial positions. In compound words that have a latin or geek prefix ending in a consonant before the 'r' it is realised as 'rr'.Eg:
rr - erre
perro
carro
arriba**
subrayar
Something you need to notice and practice is the rifferent realisation of these rothic sounds in Spanish when they are found in intervocalic position:
r - rr
caro - carro
pero - perro
So to finally answer your question, say that 'r' is the alveolar tip, and 'R' is the alveolar thrill, your words would be something like:
incluiría .- een - klwee - 'ree - ah
retiraría .- Reh - tee - rah - 'ree - ah
remember that the 'clui' bit in 'incluiría' would be a dipthong, so must be said together as one syllable, otherwise it sounds weird. Especially due to the strong dipthongising (if such a word exists) of Spanish.
Here's a recording containing all the examples above, I've made it myself and I'm from Peru.
Click this link:
http://briefcase.yahoo.com/bc//home
-Click 'Sign in': I'll share this account with you, whenever I want to show you a recording or something, the account is:
name: pedro_neo_briefcase
password: cockney
-click the folder 'Mis documentos'
-click the only file so far, r - rr.mp3, to download. And listen.
that's that, I hope you find this helpful, mate
Pete de Perú
PS.- Sorry if the Yahoo briefcase was too long, but I didn't find any other hosting site better than this, if anyone can suggest a better one, I'll be grateful.