Mixing up the V and W sounds is common for some people, for example, those from Germany and India. Get these English sounds straight in this video.
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As I am studying here in Germany I have noticed, many Germans, when they are speaking English while they have very good accents that many of them pronounce the V sound as a W. Vv as a ww, ww. For example, the word university. Vv. I hear it: uni-wer-sity. Which is strange because the German word, Universität, has the vv sound in it. It’s exactly the same in English: vv, university. Of course, it’s just a matter of changing the habit as the sound does not exist in the German language. Vv, vv. So, one just has to be carful when they’re speaking that their mouth does not go into the ww position but rather the vv. Other words: visit, very, volleyball.