What is the difference with them?

each tense has different Verbal inflection and each person has the different verbal shape!!!

anyway...it's totally different from english

Good luck for you!!!On the other hand ,long time no see!!!

thx yap,it really have been a long time...since the day that we had a lunch together near the Leader University, right!?

ya~~~~!!!Hope that there are meals and party continuously !!!!

of course!!!