Quote Originally Posted by Medved View Post
Somebody tell me the difference between "I've never used it" and "I never used it".
I suspect the difference is the same as "I used it twice" vs "I have used it twice" but how to tell one from the other is beyond my understanding.
Does anyone have a clue?
Medved, this is a case which native speakers may don't mind while they are speaking but i (and also many other people, even natives) think the correct tense should be used even in speaking, otherwise, it would bring up some questions because of it's ambiguity. Take a look at here:

1-If i say "she has never worked with computer" = she has never worked with computer in her whole life until now.
2-If i say "she never worked with computer" = at no time in the past

While some people say these two sentences mean essentially the same to them.
So, in response, you should ask them, Would they sound the same if you knew she was dead??
In AmE speakings The past tense is quite common.
But because of ambiguity of second sentence, the same AmE speaker may ask you "When did she never worked with computer? When she was a child?"
Or they might note that " you have not used the Present Perfect and thus you have not told me "up to the present time", so I wonder if she died last year."

And just to add, in BrE the second sentence Never means the same as the first one, even in their speakings.
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Here, we are in a language forum(Russian and then English, specifically), so we should learn/teach the correct form. Also we can add a useable/common form, emphasising "It's a form which is used commonly in AmE speakings" for example.