grammar.go

@@ -452,6 +452,9 @@ func articleForCurrentLanguage(lowerWord, originalWord string) (string, bool) {
 		return "", false
 	}
 
+	if article, ok := articleForPluralForm(data, lowerWord, lang); ok {
+		return article, true
+	}
 	if article, ok := articleByGender(data, lowerWord, originalWord, lang); ok {
 		return article, true
 	}
@@ -476,6 +479,32 @@ func articleByGender(data *GrammarData, lowerWord, originalWord, lang string) (s
 	return maybeElideArticle(article, originalWord, lang), true
 }
 
+func articleForPluralForm(data *GrammarData, lowerWord, lang string) (string, bool) {
+	if !isFrenchLanguage(lang) {
+		return "", false
+	}
+	if !isKnownPluralNoun(data, lowerWord) {
+		return "", false
+	}
+	return "les", true
+}
+
+func isKnownPluralNoun(data *GrammarData, lowerWord string) bool {
+	if data == nil || len(data.Nouns) == 0 {
+		return false
+	}
+	for _, forms := range data.Nouns {
+		if forms.Other == "" || core.Lower(forms.Other) != lowerWord {
+			continue
+		}
+		if forms.One != "" && core.Lower(forms.One) == lowerWord {
+			continue
+		}
+		return true
+	}
+	return false
+}
+
 func articleFromGrammarForms(data *GrammarData, word string) (string, bool) {
 	if data.Articles.IndefiniteDefault == "" && data.Articles.IndefiniteVowel == "" {
 		return "", false

grammar_test.go

@@ -334,6 +334,7 @@ func TestArticleFrenchLocale(t *testing.T) {
 		want string
 	}{
 		{"branche", "la"},
+		{"branches", "les"},
 		{"enfant", "l'"},
 		{"fichier", "le"},
 		{"inconnu", "un"},
@@ -510,6 +511,7 @@ func TestArticlePhraseFrenchLocale(t *testing.T) {
 		want string
 	}{
 		{"branche", "la branche"},
+		{"branches", "les branches"},
 		{"enfant", "l'enfant"},
 		{"fichier", "le fichier"},
 	}