[lottin]

Without proper knowledge of English phonetics and dialects, this method isn't going to take you very far. For example, in English, vowel length carries phonetic information, whereas in other languages it does not. If you mother tongue happens to fall in the latter category, it's extremely unlikely that you'll figure out how vowel length works, or even that you have to pay attention to it.

[deadbeeves]

That's not true. I use stress timing without even realizing that I'm using it nor understanding what it means, but I can realize when someone doesn't use it. I learned it purely by ear, by mimicking the sounds other people make. More specifically, by copying their cadence.

[lottin]

Yeah, like I said, it's most unlikely that you're using vowel length correctly. You can't copy something you're not aware of. For example, without looking it up, would you say 'quit' and 'quid' are pronounced with the same vowel length or not?

[deadbeeves]

"Quid" is longer.

>You can't copy something you're not aware of.

If that was the case, babies would not be able to learn how to speak.

[lottin]

Babies haven't already acquired another language, when they're learning to speak, and so there's no interference. That's not the case when someone learns a second language later in life.

> "Quid" is longer.

Feel free to post a voice recording, so we can check.

[deadbeeves]

Interference doesn't matter if all you're doing is copying what people do with their mouths. You might have more or less trouble performing the movement at the mechanical level (for example a lot of people have trouble doing the French R) or listening for the precise positions of the tongue etc., but just copying what you can hear is trivial.

>Feel free to post a voice recording, so we can check.

Nah. I have no interest in convincing you; honestly accepting to be tested at all is probably more than I should have done. I'm merely relaying a personal experience for your edification. If you can't accept it for what it is then continue as you were.

[lottin]

Interference absolutely does matter. Interference manifests itself in the form of a foreign accent, which most people have when they speak a second language. You're making an extraordinary claim, namely that you're able to speak a second language without a foreign accent. I find your claim extremely unlikely to be true, especially since you provide no evidence and you've shown that you know very little about language acquisition.