When it comes to grammar, I think English is actually a quite simple language (*). You have a relatively small number of grammatical forms, compared to e.g. German or Latin.
(*) I would be ROFL if it turns out this sentence is grammatically incorrect :lol:. I'm not a native English speaker, so I don't know for sure.
One small error: We would say "quite a" not "a quite." But for most other modifiers that you could use in that sentence, the word order you used would be correct (you could say "a really simple language," "a very simple language," "a mind-numbingly simple language," etc.)
It's an especially small error in writing, since the brain often automatically rearranges things to make sense when it comes across them in writing. I actually read it as "quite a" on the first time through, and only noticed the error on closer inspection.
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In standard British-type English we have 12 simple vowels and 4 dipthongs (some say 8, but I think they're out of date). The exact number varies according to the dialect and the authority they're quoting.
But for those coming from Japanese or Spanish, with 5 simple vowels, it's pretty tough.
In my experience, phonetics is the area which is worst taught and worst understood.
BTW, could you explain the research you mention. PM me if you think it'd be boring for the other users.
In American English we have following vowels.
(I'm using X-SAMPA as my transcription scheme. See
http://en.wikipedia.org/wiki/X-Sampa )
The simple vowels:
/{/ as in pat
/E/ as in pet
/I/ as in pit
/i/ as in Pete
/A/ as in pot* or father
/O/ as in caught*
/U/ as in put
/u/ as in food
/@/ as in
above**
/6/ as in bud** (often transcribed /V/)
*/A/ and /O/ are merged in many dialects of English, including my own, sometimes to /A/, in my case to /Q/ (See the Wikipedia article on X-SAMPA if you want to know exactly which vowel /Q/ represents).
** I have never been able to tell the difference between /@/ and /6/. I hear the same vowel in both syllables of "above" as I do in "bud."
The diphthongs:
/Ai/ as in ride
/@i/ as in write*
/oi/ as in boy
/Au/ or {u as in crowd
/Ei/ as in rate**
/@u/ as in go**
/iw/ as in few, or ewe***
* /@i/ does not appear in all dialects of American English, but does in my own. It is a variant of /Ai/ before sounds like p, t, and k, called "voiceless" sounds. Both t and d become a really fast variety of d in my dialect (X-SAMPA /4/ basically the same as the Spanish single r), and so the distinction between /Ai/ and /@i/ becomes the only difference between the two words.
** /Ei/ and /@u/ are technically diphthongs, but used to be, and often are still treated as, the simple vowels /e/ and /o/.
***/iw/ is generally transcribed /ju/, treated as a consonant plus a vowel, and thus not placed on vowel charts. However, I myself find there to a difference between the sound of /ju/, as in the word "you" or the name of the letter "U," and the sound of /iw/, as in the word "ewe" (a female sheep), or the exclamation of disgust "Ewww!"
The letter r:
Many treatments of American English count "r" as an "r-colored" vowel, /@`/, and if one does so, one could conceivably treat all vowels followed by r as diphthongs, although this is not usually done.
Depending on how you count things, there are between 8 and 10 simple vowels (or up to 13 if you count /Ei/ and /@u/ as /e/ and /o/), between 5 and 7 diphthongs (or as few as 3 if you exclude /Ei/ and /@u/), plus the possibility of having r as a simple vowel, bringing the total as high as 11, and vowels followed by r as diphthongs, bringing the total even higher. (There are alot of complications, so I won't attempt to count the total potential number of r-diphtongs).
With 10 simple vowels plus r, and 7 diphthongs, you get 18 vowels. With 8 simple vowels, not including r, and 5 diphthongs, you get 13 vowels.
So American English has, as a back-of-the-envelope count, between 13 and 18 vowels.