diff --git a/Documentation/GenerationLibrary/enums/Generation.md b/Documentation/GenerationLibrary/enums/Generation.md
index 1287720..efc7c7e 100644
--- a/Documentation/GenerationLibrary/enums/Generation.md
+++ b/Documentation/GenerationLibrary/enums/Generation.md
@@ -44,6 +44,16 @@ Generate the variables for the translations.
     - defaultLanguage: The default language.
 - Returns: The syntax.
 
+### `parseValue(defaultTranslation:translations:language:arguments:)`
+
+Parse the content of a switch case.
+- Parameters:
+    - defaultTranslation: The translation without any conditions (always required).
+    - translations: All the available translations for an entry.
+    - language: The language.
+    - arguments: The arguments of the entry.
+- Returns: The syntax.
+
 ### `generateLanguageFunction(dictionary:defaultLanguage:)`
 
 Generate the function for getting the translated string for a specified language code.
diff --git a/README.md b/README.md
index ae93f45..4305dbd 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,12 @@ house:
     en: House
     de: Haus
     fr: Maison
+
+houses(count):
+    en(count == "1"): There is one house.
+    en: There are (count) houses.
+    de(count == "1"): Es gibt ein Haus.
+    de: Es gibt (count) Häuser.
 ```
 
 Then, access the localized strings safely in your code:
@@ -35,6 +41,7 @@ Then, access the localized strings safely in your code:
 // Use the system language
 print(Loc.hello(name: "Peter"))
 print(Loc.house)
+print(Loc.houses(count: "1"))
 
 // Access the translation for a specific language
 print(Localized.hello(name: "Peter").en)
@@ -70,11 +77,13 @@ export:
     de: Exportiere das Dokument
 
 send(message, name):
+    en(name == ""): Send (message).
     en: Send (message) to (name).
     de: Sende (message) to (name).
 ```
 
-As you can see, you can add parameters using brackets after the key.
+As you can see, you can add parameters using brackets after the key,
+and conditions using brackets after the language (e.g. for pluralization).
 
 The line `default: en` sets English as the fallback language.
 
diff --git a/Sources/GenerationLibrary/Generation.swift b/Sources/GenerationLibrary/Generation.swift
index d0f7777..5594330 100644
--- a/Sources/GenerationLibrary/Generation.swift
+++ b/Sources/GenerationLibrary/Generation.swift
@@ -151,13 +151,18 @@ public enum Generation {
                 guard let valueForLanguage = entry.value[language] ?? entry.value[defaultLanguage] else {
                     throw GenerationError.missingTranslationInDefaultLanguage(key: key.0)
                 }
+                let value = parseValue(
+                    defaultTranslation: valueForLanguage,
+                    translations: entry.value,
+                    language: language,
+                    arguments: key.1
+                )
                 if key.1.isEmpty {
                     variable += indent("\ncase .\(entry.key):", by: indentTwo)
-                    variable += indent("\n\"\(valueForLanguage)\"", by: indentThree)
+                    variable += value
                 } else {
-                    let translation = parse(translation: valueForLanguage, arguments: key.1)
                     variable += indent("\ncase let .\(entry.key):", by: indentTwo)
-                    variable += indent("\n\"\(translation)\"", by: indentThree)
+                    variable += value
                 }
             }
             variable += indent("\n    }\n}", by: indentOne)
@@ -169,6 +174,42 @@ public enum Generation {
         return result
     }
 
+    /// Parse the content of a switch case.
+    /// - Parameters:
+    ///     - defaultTranslation: The translation without any conditions (always required).
+    ///     - translations: All the available translations for an entry.
+    ///     - language: The language.
+    ///     - arguments: The arguments of the entry.
+    /// - Returns: The syntax.
+    static func parseValue(
+        defaultTranslation: String,
+        translations: [String: String],
+        language: String,
+        arguments: [String] = []
+    ) -> String {
+        var value = "\n"
+        let conditionTranslations = translations.filter { $0.key.hasPrefix(language + "(") }
+        let lastTranslation = parse(translation: defaultTranslation, arguments: arguments)
+        if conditionTranslations.isEmpty {
+            return indent("\n\"\(lastTranslation)\"", by: indentThree)
+        }
+        for translation in conditionTranslations {
+            var condition = translation.key.split(separator: "(")[1]
+            condition.removeLast()
+            value.append(indent("""
+             if \(condition) {
+                \"\(parse(translation: translation.value, arguments: arguments))\"
+            } else
+            """, by: indentThree))
+        }
+        value.append("""
+         {
+            \"\(lastTranslation)\"
+        }
+        """)
+        return value
+    }
+
     /// Generate the function for getting the translated string for a specified language code.
     /// - Parameters:
     ///     - dictionary: The parsed YML.
@@ -199,7 +240,7 @@ public enum Generation {
     static func getLanguages(dictionary: [String: [String: String]]) -> [String] {
         var languages: Set<String> = []
         for key in dictionary {
-            languages = languages.union(key.value.map { $0.key })
+            languages = languages.union(key.value.compactMap { $0.key.components(separatedBy: "(").first })
         }
         return .init(languages)
     }
diff --git a/Tests/PluginTests/Localized.yml b/Tests/PluginTests/Localized.yml
index 0a489b4..4eafe72 100644
--- a/Tests/PluginTests/Localized.yml
+++ b/Tests/PluginTests/Localized.yml
@@ -10,6 +10,16 @@ house:
     de: Haus
     fr: Maison
 
+houses(count):
+    en(count == "1"): There is one house.
+    en(count == "0"): There is no house.
+    en: There are (count) houses.
+    de(count == "1"): Es gibt ein Haus.
+    de(count == "0"): Es gibt kein Haus.
+    de: Es gibt (count) Häuser.
+    # There is no French translation for this phrase.
+    # The default language, in this case English, will be used.
+
 helloPair(name1, name2):
     en: Hello, (name1) and (name2)!
     de: Hallo, (name1) und (name2)!
diff --git a/Tests/PluginTests/Tests.swift b/Tests/PluginTests/Tests.swift
index 9eafff2..920be26 100644
--- a/Tests/PluginTests/Tests.swift
+++ b/Tests/PluginTests/Tests.swift
@@ -20,6 +20,9 @@ enum Tests {
         print("DE_CH: \(Localized.house.string(for: "de_CH"))")
         print("SYSTEM: \(Localized.house.string)")
         print("EN: \(Localized.helloPair(name1: "Max", name2: "Ruedi").en)")
+        print(Loc.houses(count: "0"))
+        print(Loc.houses(count: "1"))
+        print(Loc.houses(count: "2"))
     }
 
 }
diff --git a/Tests/Tests.swift b/Tests/Tests.swift
deleted file mode 100644
index d0e6a37..0000000
--- a/Tests/Tests.swift
+++ /dev/null
@@ -1,43 +0,0 @@
-//
-//  Tests.swift
-//  Localized
-//
-//  Created by david-swift on 27.02.2024.
-//
-
-import Foundation
-import Localized
-
-#localized(default: "en", yml: """
-hello(name):
-    en: Hello, (name)!
-    de: Hallo, (name)!
-    fr: Salut, (name)!
-
-house:
-    en: House
-    de: Haus
-    fr: Maison
-
-helloPair(name1, name2):
-    en: Hello, (name1) and (name2)!
-    de: Hallo, (name1) und (name2)!
-    fr: Salut, (name1) et (name2)!
-""")
-
-/// Test cases for the `localized` macro.
-@main
-enum Tests {
-
-    /// Test the `localized` macro.
-    static func main() {
-        print("EN: \(Localized.hello(name: "Peter").en)")
-        print("DE: \(Localized.hello(name: "Ruedi").de)")
-        print("SYSTEM: \(Loc.hello(name: "Sams"))")
-        print("FR: \(Localized.house.fr)")
-        print("DE_CH: \(Localized.house.string(for: "de_CH"))")
-        print("SYSTEM: \(Localized.house.string)")
-        print("EN: \(Localized.helloPair(name1: "Max", name2: "Ruedi").en)")
-    }
-
-}