@amiloradovsky In French, the ellision (which is rendered by an apostrophe) occurs to avoid a hiatus. It's more a merging of vowels of two consecutive words (the final vowel merging of a word ending with a vowel merging with the initial vowel of a word starting with a vowel).
While orally the ellision frequently occurs, it is not always written with an apostrophe. Only small grammatical words of one syllable are concerned in French by a replacement with an apostrophe.
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