diff --git a/nameparser/parser.py b/nameparser/parser.py
index cb88a84..7b71cd9 100644
--- a/nameparser/parser.py
+++ b/nameparser/parser.py
@@ -570,8 +570,8 @@ def is_conjunction(self, piece: str) -> bool:
             for item in piece:
                 if self.is_conjunction(item):
                     return True
-        else:
-            return piece.lower() in self.C.conjunctions and not self.is_an_initial(piece)
+            return False
+        return piece.lower() in self.C.conjunctions and not self.is_an_initial(piece)
 
     def is_prefix(self, piece: str) -> bool:
         """
@@ -582,8 +582,8 @@ def is_prefix(self, piece: str) -> bool:
             for item in piece:
                 if self.is_prefix(item):
                     return True
-        else:
-            return lc(piece) in self.C.prefixes
+            return False
+        return lc(piece) in self.C.prefixes
 
     def is_bound_first_name(self, piece: str) -> bool:
         """Lowercased, leading/trailing-periods-stripped version of piece is in :py:attr:`~nameparser.config.Constants.bound_first_names`."""
@@ -641,6 +641,7 @@ def is_suffix(self, piece: str) -> bool:
             for item in piece:
                 if self.is_suffix(item):
                     return True
+            return False
         else:
             return ((lc(piece).replace('.', '') in self.C.suffix_acronyms)
                     or (lc(piece) in self.C.suffix_not_acronyms)) \
@@ -852,7 +853,7 @@ def fix_phd(self) -> None:
 
         if match := _re.search(self._full_name):
             self.suffix_list.extend(match.groups())
-            self._full_name = _re.sub('', self._full_name)
+            self._full_name = _re.sub("", self._full_name)
 
     def parse_nicknames(self) -> None:
         """
diff --git a/tests/test_python_api.py b/tests/test_python_api.py
index 2dbf504..66d067d 100644
--- a/tests/test_python_api.py
+++ b/tests/test_python_api.py
@@ -286,12 +286,30 @@ def test_is_prefix_with_list(self) -> None:
         self.assertTrue(hn.is_prefix(items))
         self.assertTrue(hn.is_prefix(items[1:]))
 
+    def test_is_prefix_with_list_no_match(self) -> None:
+        hn = HumanName()
+        self.assertFalse(hn.is_prefix(['firstname', 'lastname']))
+
     def test_is_conjunction_with_list(self) -> None:
         hn = HumanName()
         items = ['firstname', 'lastname', 'and']
         self.assertTrue(hn.is_conjunction(items))
         self.assertTrue(hn.is_conjunction(items[1:]))
 
+    def test_is_conjunction_with_list_no_match(self) -> None:
+        hn = HumanName()
+        self.assertFalse(hn.is_conjunction(['firstname', 'lastname']))
+
+    def test_is_suffix_with_list(self) -> None:
+        hn = HumanName()
+        items = ['firstname', 'lastname', 'jr']
+        self.assertTrue(hn.is_suffix(items))
+        self.assertTrue(hn.is_suffix(items[1:]))
+
+    def test_is_suffix_with_list_no_match(self) -> None:
+        hn = HumanName()
+        self.assertFalse(hn.is_suffix(['firstname', 'lastname']))
+
     def test_override_constants(self) -> None:
         C = Constants()
         hn = HumanName(constants=C)