[JDcap]

Dear friend.

In linguistic, time is not the same thing as tense. Time is an element of our experince of reality yet tense is a purely grammatical idea. According to our normal perception, time is divided into Past, Present and Future. We refer to the exact moment of speaking as "the point NOW" and the past time is time before NOW. In real time there is no such thing as 'a present period"- by definition a period must extend in time, and therefore cannot be wholly 'in" present time.

From the point of view of the language we use, it is clearly the psychological time, then way we precive the action, which is important, not what 'objectively happened" .

In teaching a language, recently the idea of a national/ functional approach has been much popular and this may be suit to the need to cater the diffrent preception of people toward some expreinces which deal with "time' and this has be pointed out by Shun.

Overall, what i can say, all of the riddles that play in ur mind might be expressed diffently with others due to pyschological time and time is not a technical term compared to tense. If ur case, the notion of "yesterday' is regard as past time if you are refering to the past events yet if you are talking about the next yesterday's" so, i would rather to ask you to see where do u stand for?i mean do ask weather u are talking about real, objective time or what we might perhaps call psychological time. Obhectively speaking any object even which happens takes acertain length of time.Besides, we cannot analyse the language a person uses independently of that person's perception of ehat happened ( as you are debating and questioning the exact status of 'yesterday" by considering the aspect of 'past time".

I hope those experts and linguists may split out thier ideas and do correct me if i were wrong. Till then, have a nice day people.