diff --git a/stdlib/3/inspect.pyi b/stdlib/3/inspect.pyi
index fbc7508a5..861902948 100644
--- a/stdlib/3/inspect.pyi
+++ b/stdlib/3/inspect.pyi
@@ -62,14 +62,24 @@ def ismodule(object: object) -> bool: ...
 def isclass(object: object) -> bool: ...
 def ismethod(object: object) -> bool: ...
 def isfunction(object: object) -> bool: ...
-def isgeneratorfunction(object: object) -> bool: ...
+
+if sys.version_info >= (3, 8):
+    def isgeneratorfunction(obj: object) -> bool: ...
+    def iscoroutinefunction(obj: object) -> bool: ...
+
+else:
+    def isgeneratorfunction(object: object) -> bool: ...
+    def iscoroutinefunction(object: object) -> bool: ...
+
 def isgenerator(object: object) -> bool: ...
-def iscoroutinefunction(object: object) -> bool: ...
 def iscoroutine(object: object) -> bool: ...
 def isawaitable(object: object) -> bool: ...
 
 if sys.version_info >= (3, 6):
-    def isasyncgenfunction(object: object) -> bool: ...
+    if sys.version_info >= (3, 8):
+        def isasyncgenfunction(obj: object) -> bool: ...
+    else:
+        def isasyncgenfunction(object: object) -> bool: ...
     def isasyncgen(object: object) -> bool: ...
 
 def istraceback(object: object) -> bool: ...
@@ -89,12 +99,12 @@ def ismemberdescriptor(object: object) -> bool: ...
 _SourceObjectType = Union[ModuleType, Type[Any], MethodType, FunctionType, TracebackType, FrameType, CodeType, Callable[..., Any]]
 
 def findsource(object: _SourceObjectType) -> Tuple[List[str], int]: ...
-def getabsfile(object: _SourceObjectType) -> str: ...
+def getabsfile(object: _SourceObjectType, _filename: Optional[str] = ...) -> str: ...
 def getblock(lines: Sequence[str]) -> Sequence[str]: ...
 def getdoc(object: object) -> Optional[str]: ...
 def getcomments(object: object) -> Optional[str]: ...
 def getfile(object: _SourceObjectType) -> str: ...
-def getmodule(object: object) -> Optional[ModuleType]: ...
+def getmodule(object: object, _filename: Optional[str] = ...) -> Optional[ModuleType]: ...
 def getsourcefile(object: _SourceObjectType) -> Optional[str]: ...
 def getsourcelines(object: _SourceObjectType) -> Tuple[List[str], int]: ...
 def getsource(object: _SourceObjectType) -> str: ...
@@ -154,6 +164,7 @@ class BoundArguments:
     args: Tuple[Any, ...]
     kwargs: Dict[str, Any]
     signature: Signature
+    def __init__(self, signature: Signature, arguments: OrderedDict[str, Any]) -> None: ...
     def apply_defaults(self) -> None: ...
 
 #
diff --git a/tests/stubtest_whitelists/py38.txt b/tests/stubtest_whitelists/py38.txt
index 081529b3c..4da2d3eb3 100644
--- a/tests/stubtest_whitelists/py38.txt
+++ b/tests/stubtest_whitelists/py38.txt
@@ -50,9 +50,6 @@ http.cookiejar.DefaultCookiePolicy.__init__
 http.server.SimpleHTTPRequestHandler.__init__
 importlib.metadata.DistributionFinder.Context.pattern
 importlib.metadata.EntryPointBase
-inspect.isasyncgenfunction
-inspect.iscoroutinefunction
-inspect.isgeneratorfunction
 ipaddress.IPv4Interface.hostmask
 ipaddress.IPv6Interface.hostmask
 ipaddress._BaseNetwork.broadcast_address