diff --git a/samples/basic/do_for.py b/samples/basic/do_for.py
index 8db278f..3aeda8b 100755
--- a/samples/basic/do_for.py
+++ b/samples/basic/do_for.py
@@ -9,3 +9,9 @@
 # 打印数字 0 - 9
 for x in range(10):
     print(x)
+
+# third example
+
+age = ('bob', 'mick')
+for ages in age:
+    print(ages)
diff --git a/samples/basic/do_if.py b/samples/basic/do_if.py
index c0c16d7..3143090 100755
--- a/samples/basic/do_if.py
+++ b/samples/basic/do_if.py
@@ -13,3 +13,12 @@
     print('teenager')
 else:
     print('kid')
+
+# second example
+
+quiz = input("what is third planet on our solar system")
+
+if quiz == "earth":
+    print("correct")
+else:
+    print("wrong")
diff --git a/samples/basic/do_input.py b/samples/basic/do_input.py
index 783523a..0bac47e 100755
--- a/samples/basic/do_input.py
+++ b/samples/basic/do_input.py
@@ -3,3 +3,8 @@
 
 name = input()
 print('Hello,', name)
+
+# second example
+
+age = input("what is your age")
+print(" your age is," age)
diff --git a/samples/basic/do_print.py b/samples/basic/do_print.py
index 1330003..674fd02 100755
--- a/samples/basic/do_print.py
+++ b/samples/basic/do_print.py
@@ -5,3 +5,4 @@
 print(300)
 print(100 + 200)
 print('100 + 200 =', 100 + 200)
+print("1/2 + 1/2")