How do you say when you didn't do something you should do? Would you use present perfect to express it? example 'I have left the door opened' Mother: Did you close the door? Son : I have left the door opened. I thought Jenny was there. Sorry. I have left the door opened, so the door is not closed. In the Philippines, we have expression such as 'Naiwan kong bukas ang pinto'. It means that I left the door open unintentionally. We have expressions that starts with 'Na-' and it means two things: the action is in the past & unintentional. Could I use present perfect to express it? We have already equivalent expression of past tense. 'Sinara ko ang pinto' means 'I closed the door.' All verb with '_in_' such as kinuha, sinulat, sinira, etc are all past tense. Thanks.

In 'My feelings then,' does 'then' mean 'after' or 'that time'? Could I use 'then' as a means of 'that time in the past' and not 'after'?

Do you know the equivalent expression of 'Nasabi ko, nasira ko, nasulatan ko in English? All expressions with verb that starts from a prefix-'na'. It is somewhat something done in the past. Are they fall under present perfect tenses? I think present perfect is more on 'Nag+root word'

Does the meaning of 'for a while' 'long time' or 'just a minute'? In the Philippines, 'for a while' is widely known as 'just a minute,' 'just a second,' but an author of the mini book "Equipments, Pictorials and For a While (common mistakes made by Pinoys)" said that 'for a while' means long time. Is that true?

Does 'I have said' means I said something many times? Doesn't it mean you said something once in the past, but you didn't mean it and just as you just said it without realizing what you said? Like, I'm sorry for what I have said (once). I didn't mean it. Also, does 'I have noticed' means I noticed something many times before and continues up to present? Or, just as you just noticed something once in the past? The same with 'I have realized,' does it mean realizing once or many times?You said it could be once or it could be many times? So, you mean all verbal phrases with 'have' (present perfect tenses), could mean both? I know that present perfect such as 'I have lived in UK for 3 years' means that I started living in UK 3 years ago up to the near present, but I do not know for 'I have noticed,' 'I have realized,' and 'I have said' because there is no prepositional phrase as 'for 3 years' I was confused because one English book said that Present Perfect Tense is:1) indefinite past time 2) action started in the past and continuing up to the present <I have been a working student since two years ago. The 2nd English book said 1) a completed or finished action at an indefinite point of time in the past <Bert has left for abroad> 2) an action w/c began in the past and has continued up to the present <They have worked in the field for three hours> The 3rd English book said 1) actual past-to-present time 2) psychological past-to-present time <He has just come in>And the 3rd book said about actual past-to-present that the duration of an event ends with the moment of speaking (actual time)no difference of past to present perfect