New answers tagged prononciation
In this particular case, they are pronounced the same way, because the first letters of magnifique and couleur (respectively m and c) are consonants. But in this example, you hear the difference: Quelle étrange abeille ! Quelles étranges abeilles ! Especially because the firsts letters of "étrange" and "abeille" (respectively e and a) are ...
Not a book, but an excellent resource for pronunciation guidelines is forvo.com. You can search for almost any word with pronunciations recorded and submitted by (supposedly*) native speakers. Some examples for a verb (jouer - all present tense forms + past participle, imperfect and future): joue joues jouons jouez jouent joué jouais jouerai As ...
As said Laure in comment, they are pronounced in exactly the same way. You can't distinguish if your are talking about one or many colours.
When a voiced consonant (b,d,j) is followed by an unvoiced consonant (s,f,t) we're used to pronounce it as un unvoiced one ("p" instead of "b", "sh" instead of "j") but as far as I know, it's not a rule, it's rather a phonetic phenomenon. Actually, it's not impossible to pronounce a clear "b" in "absent", "abscons", "obscurité"; but it would be like ...
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