Update introduction-to-classes.md

docs/csharp/tutorials/intro-to-csharp/introduction-to-classes.md

@@ -67,7 +67,7 @@ namespace classes
 
 Before going on, let's take a look at what you've built.  The `namespace` declaration provides a way to logically organize your code. This tutorial is relatively small, so you'll put all the code in one namespace. 
 
-`public class BankAccount` defines the class, or type, you are creating. Everything inside the `{` and `}` that follows the class declaration defines the behavior of the class. There are five ***members*** of the `BankAccount` class. The first three are ***properties***. Properties are data elements and can have code that enforces validation or other rules. The last two are ***methods***. Methods are blocks of code that perform a single function. Reading the names of each of the members should provide enough information for you or another developer to understand what the class does.
+`public class BankAccount` defines the class, or type, you are creating. Everything inside the `{` and `}` that follows the class declaration defines the state and behavior of the class. There are five ***members*** of the `BankAccount` class. The first three are ***properties***. Properties are data elements and can have code that enforces validation or other rules. The last two are ***methods***. Methods are blocks of code that perform a single function. Reading the names of each of the members should provide enough information for you or another developer to understand what the class does.
 
 ## Open a new account
 
@@ -83,7 +83,7 @@ public BankAccount(string name, decimal initialBalance)
 }
 ```
 
-Constructors are called when you create an object using [`new`](../../language-reference/operators/new-operator.md). Replace the line `Console.WriteLine("Hello World!");` in *Program.cs* with the following line (replace `<name>` with your name):
+Constructors are called when you create an object using [`new`](../../language-reference/operators/new-operator.md). Replace the line `Console.WriteLine("Hello World!");` in *Program.cs* with the following code (replace `<name>` with your name):
 
 ```csharp
 var account = new BankAccount("<name>", 1000);
@@ -100,7 +100,7 @@ Add the following member declaration to the `BankAccount` class:
 private static int accountNumberSeed = 1234567890;
 ```
 
-This is a data member. It's `private`, which means it can only be accessed by code inside the `BankAccount` class. It's a way of separating the public responsibilities (like having an account number) from the private implementation (how account numbers are generated.) It is also `static`, which means it is shared by all of the `BankAccount` objects. The value of a non-static variable is unique to each instance of the `BankAccount` object. Add the following two lines to the constructor to assign the account number:
+This is a data member. It's `private`, which means it can only be accessed by code inside the `BankAccount` class. It's a way of separating the public responsibilities (like having an account number) from the private implementation (how account numbers are generated). It is also `static`, which means it is shared by all of the `BankAccount` objects. The value of a non-static variable is unique to each instance of the `BankAccount` object. Add the following two lines to the constructor to assign the account number:
 
 ```csharp
 this.Number = accountNumberSeed.ToString();