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Originally Posted by shun  My reply: After all, you know about the subject of time. However, my doubt is, they each have past, present, and past parts in itself, so where is the present part? How to define the present part of them? |
I believe you are still confused as to what the so-called "Present" is.
May be the following type of sentence confuses you:
"It happened today".
Generally, today is the 'Present'. Here it refers to something that happened in the earlier part of 'today'. Today is grammatically the "Present". However, as I explained before a day also can have divisions. So, in the evening you refer to something that happened in the morning as a past event. Anything that happened before this particular moment is the past.
What if you say, "It happens today" ? It denotes the future time (not the future tense).