diff --git a/guides/source/active_model_basics.md b/guides/source/active_model_basics.md
index 72daa29f7f..a35d0e4067 100644
--- a/guides/source/active_model_basics.md
+++ b/guides/source/active_model_basics.md
@@ -87,7 +87,7 @@ end
 ### Conversion
 
 If a class defines `persisted?` and `id` methods, then you can include the
-`ActiveModel::Conversion` module in that class and call the Rails conversion
+`ActiveModel::Conversion` module in that class, and call the Rails conversion
 methods on objects of that class.
 
 ```ruby
@@ -132,7 +132,7 @@ class Person
   end
 
   def last_name
-    @last_name
+    @last_nameperson.changes # => {"first_name"=>[nil, "First Name"]}
   end
 
   def last_name=(value)
@@ -156,16 +156,17 @@ person.changed? # => false
 person.first_name = "First Name"
 person.first_name # => "First Name"
 
-# returns true if any of the attributes have unsaved changes, false otherwise.
+# returns true if any of the attributes have unsaved changes.
 person.changed? # => true
 
 # returns a list of attributes that have changed before saving.
 person.changed # => ["first_name"]
 
-# returns a hash of the attributes that have changed with their original values.
+# returns a Hash of the attributes that have changed with their original values.
 person.changed_attributes # => {"first_name"=>nil}
 
-# returns a hash of changes, with the attribute names as the keys, and the values will be an array of the old and new value for that field.
+# returns a Hash of changes, with the attribute names as the keys, and the
+# values as an array of the old and new values for that field.
 person.changes # => {"first_name"=>[nil, "First Name"]}
 ```
 
@@ -179,7 +180,7 @@ person.first_name # => "First Name"
 person.first_name_changed? # => true
 ```
 
-Track what was the previous value of the attribute.
+Track the previous value of the attribute.
 
 ```ruby
 # attr_name_was accessor
@@ -187,7 +188,7 @@ person.first_name_was # => nil
 ```
 
 Track both previous and current value of the changed attribute. Returns an array
-if changed, else returns nil.
+if changed, otherwise returns nil.
 
 ```ruby
 # attr_name_change
@@ -197,7 +198,7 @@ person.last_name_change # => nil
 
 ### Validations
 
-The `ActiveModel::Validations` module adds the ability to validate class objects
+The `ActiveModel::Validations` module adds the ability to validate objects
 like in Active Record.
 
 ```ruby
@@ -225,7 +226,7 @@ person.valid?                        # => raises ActiveModel::StrictValidationFa
 
 ### Naming
 
-`ActiveModel::Naming` adds a number of class methods which make the naming and routing
+`ActiveModel::Naming` adds a number of class methods which make naming and routing
 easier to manage. The module defines the `model_name` class method which
 will define a number of accessors using some `ActiveSupport::Inflector` methods.
 
@@ -248,7 +249,7 @@ Person.model_name.singular_route_key  # => "person"
 
 ### Model
 
-`ActiveModel::Model` adds the ability to a class to work with Action Pack and
+`ActiveModel::Model` adds the ability for a class to work with Action Pack and
 Action View right out of the box.
 
 ```ruby
@@ -308,7 +309,7 @@ class Person
 end
 ```
 
-Now you can access a serialized hash of your object using the `serializable_hash`.
+Now you can access a serialized hash of your object using the `serializable_hash` method.
 
 ```ruby
 person = Person.new