My research on English linguistics finally told me that our own mind has a language sense which I coined as Language Quotient (LQ). It is same as mental grammar. Our mind receives information through the nervous system by senses like touch etc. while experimenting on my theory of feel & learn. I asked a group of children (With no idea of vowels or consonants) to separate vowels and consonants; for this, I simply told them the logic i.e. if a letter is spoken without using lips and/or tongue then mark it as vowel and if a letter is spoken with the help of lips and/or tongue then it is a consonant for sure. The result was amazing, 99 percent children identified all the vowels and consonants correctly and also, now they had a logic of how did they do it.
Please perform this practical activity among your students and do let me know your experience.