Typing tutor

Hey as part of my assignment I have to design a flash typing tutor game, this is the code I have so far but it does not seem to be working, when the user types what is shown another word is suppose to appear but nothing happens!
Can someone please give me a hand?
Thank you so much!

tf is my user input text field
and displayText is a dynamic text field used to display what I want the user to type
Here is the code:

tf.border = true;
var words:Array = [“word1”,“word2”,“word3”,“word4”,“word5”,“word6”,“word7”,“word8”,“word9”,“word10”];

var curWord = 1
displayText.text = words[curWord-1]

tf.addEventListener(KeyboardEvent.KEY_DOWN,reportKeyDown);

function reportKeyDown(event:KeyboardEvent):void
{
trace("Key Pressed: " + String.fromCharCode(event.charCode));
if (tf.text == words[curWord-1]){
if (curWord <= 9){
curWord++
}else{
curWord=1
}
}

}