diff --git a/src/yuheng/__init__.py b/src/yuheng/__init__.py
index ecacb70..cd53104 100644
--- a/src/yuheng/__init__.py
+++ b/src/yuheng/__init__.py
@@ -341,14 +341,12 @@ def have_multi_elements(element_id_string: str) -> bool:
                         )
                     )
                     + "/"
-                    + (
-                        prefix_normalization(element_type, mode="p2prefix")
-                        + "s"
+                    + prefix_normalization(
+                        element_type, mode="p2prefix", plural=True
                     )
                     + "?"
-                    + (
-                        prefix_normalization(element_type, mode="p2prefix")
-                        + "s"
+                    + prefix_normalization(
+                        element_type, mode="p2prefix", plural=True
                     )
                     + "="
                     + ",".join(pure_id_list)
diff --git a/src/yuheng/method/transform.py b/src/yuheng/method/transform.py
index 7fe5e01..1d6addd 100644
--- a/src/yuheng/method/transform.py
+++ b/src/yuheng/method/transform.py
@@ -1,28 +1,43 @@
 from typing import Optional
 
 
-def prefix_normalization(source: str, mode="p2prefix") -> str:
+def prefix_normalization(source: str, mode="p2prefix", plural=False) -> str:
     if mode == "p2prefix":
         if source == "n" or source == "node":
-            return "node"
+            if plural == False:
+                return "node"
+            else:
+                return "nodes"
         if source == "w" or source == "way":
-            return "way"
+            if plural == False:
+                return "way"
+            else:
+                return "ways"
         if source == "r" or source == "relation":
-            return "relation"
+            if plural == False:
+                return "relation"
+            else:
+                return "relations"
         if source == "c" or source == "changeset":
-            return "changeset"
+            if plural == False:
+                return "changeset"
+            else:
+                return "changesets"
         if source == "v" or source == "version":
-            return "version"
+            if plural == False:
+                return "version"
+            else:
+                return "versions"
     elif mode == "prefix2p":
-        if source == "n" or source == "node":
+        if source in ["n", "node", "nodes"]:
             return "n"
-        if source == "w" or source == "way":
+        if source in ["w", "way", "nodes"]:
             return "w"
-        if source == "r" or source == "relation":
+        if source in ["r", "relation", "relations"]:
             return "r"
-        if source == "c" or source == "changeset":
+        if source in ["c", "changeset", "changesets"]:
             return "c"
-        if source == "v" or source == "version":
+        if source in ["v", "version", "versions"]:
             return "v"