I am not native speaker of English and I am still learning it.
I hear a lot of usage of phrase "I forget". As far as I studied at school Present Indefinite Tense should be used with such words like "usually, always, every day, etc". My friend is using it all the time instead of Past tense, or Past Perfect tense. Ex: What did you do last week-end? Oh, I forget." "Where is your key? - I forget them." "What time is she coiming? - I forgtet." I feel that it is better to use " I forgot or I have forgotten" or even "I do not remember". Please tell me what is right.