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very sorry to all, i know tis will be a very silly question, since i dont understand, so i must ask here. sorry for those who feel this stupid
i can not differentiate between when to u present tense and past tense sometimes.
For example,
1. I got my result just now
2. I realized that i have missed the class.
3 .I understand what u mean.
We usually say "I (understand) what u mean" when we have understood something transmitted by someone. Since we have understood, then why we can not say " I (understood) what u mean" [we have understood already what?
For case 1 and 2, after have gotten the result and realized something, then we use past tense for it.
Why case 1 and case 2 have the same situation, but different in sentence grammar??
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Comments  
Hi
in the first, there is "just now", and "just" is used with the past or the present perfect. So you say "I just saw my result. I just finished. I got it just now. Etc."
As for the other question:

I understand (= now) what you mean (= what you want to tell me now).
I understood (= at some moment in the past) what you meant.

If you understand now, or you just understood, you can say that "You understand". If you say "I understood", it sounds like you are referring to some specific moment in the past. I know it might seem strange, but I learned that in English it works that way. If someone tells me something, in my language I can reply "I understood", but I was told in English I have to say "I understand". Emotion: smile
Regarding 'understand', if I'm not mistaken, it's a state verb. That means you're still in the state of 'understand'. Therefore, you should use the present tense unless you're referring to a past incident and your state of 'understand' in the past. Just my thought.
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1. I am mistaken.
2. I am interested.
3. I am distracted by peter.
Case 1 and 2 use the tense with same function, but case 3 does not , how to explain it? If case 3 is the correct sentense, then case 1 should be i am mistaken by ???. and case 2 should be i am interested by???. if case 1 and case2 are the correct sentence then case 3 should be i am distracted peter???
As far as tense is concerned, all of them use the same tense, the present.
Well, mistaken and interested are used as adjectives in your examples, while distracted is a past participle that is part of a passive structure, so it's a different structure. However, you could use distracted as an adjective too, so you could also say "I am distracted" = (anxious and unable to think clearly).

Saying "I am mistaken" is basically the same structure as "I am worried, I am happy, I am wrong, etc."
As for passive structures, they come form an active one:
A ball hit me. --> I was hit (by a ball).
Peter distracted me. --> I was distracted (by Peter).


Emotion: smile
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The competition is started on morning?
is this accepted??
jaylhw1

1. I am mistaken.

2. I am interested.

3. I am distracted by peter.

All of the above are past participles used as adjectives to show the states. i.e. I am pleased to inform you….

# 3 is a passive tense. I was distracted / disrupted by a loud scream outside of my window while I was studying in bed last night. In this context, the past particples are used as verb in passive voice.

Our company’s quarterly meeting was disruppted by the fire alarm- Disrupted can be viewed as past participle adjective, or a verb used in passive voice.
Hi In the above reply posted by jaylhw1 on Mon. apr.21 2008 you said the use of "I am mistaken" is the same structure as " I am worried" Could you please explain to me which structure that may be? I can not come clear with the use of "I am" coupled with a verb in the past tense such as I am interested. Please help!
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