Forget: "I always forget to lock the door when I go off to work".
Forgot: A: "Did you buy the pizzas?" B: "Sorry, love, I forgot..."
well,starter please don't panic .It's a piece of cake.
1- use ,forget , if you are not careless or when you didn't neglect the matter.
2- use , forgot, if you were careless about the matter i.e. , when you neglect the matter.
*Sigh* It is 'I have forgotten' not 'I forgot'. Tisk tisk
*Sigh*
Do you wish to share with us why "I forgot" is incorrect?