What are the built-in commands in Bourne Shell?

The shells have a number of built-in, or native commands. These commands are executed directly in the shell and don’t have to call another program to be run.
These built-in commands are different for the different shells.For the Bourne shell some of the more commonly used built-in commands are:
     :         null command
     .         source (read and execute) commands from a file
     case         case conditional loop
     cd         change the working directory (default is $HOME)
     echo         write a string to standard output
     eval         evaluate the given arguments and feed the result back to the shell
     exec         execute the given command, replacing the current shell
     exit         exit the current shell
     export         share the specified environment variable with subsequent shells
     for         for conditional loop
     if         if conditional loop
     pwd         print the current working directory
     read         read a line of input from stdin
     set         set variables for the shell
     test         evaluate an expression as true or false
     trap         trap for a typed signal and execute commands
     umask         set a default file permission mask for new files
     unset         unset shell variables
     wait         wait for a specified process to terminate
     while         while conditional loop