The Tense of Verbs
Present Tense:  
Simple Present Tense
Present Continuous Tense
Present Perfect Tense

Past Tense:
Simple Past Tense
Past Continuous Tense
Past Perfect Tense

Future Tense:
Simple Future Tense
Future Continuous Tense
Future Perfect Tense
In gerenal, the tense of verbs can be classified as follow:
The Simple Present Tense

1. expressing everyday works/activites/behaviors.
   e.g. I
go to school every day.

2. expressing habits or things you do/do not do frequently. (always, often, usually, seldom, never)
   e.g. He always
sleeps late.

3. expressing things that are always true.
   e.g. The sun
rises in the east. 
The Present Continuous Tense

1. expressing continuous action when talking or writing. (now)
   e.g. I
am singing now.

2. expressing activities/behaviors occurs very soon.
  e.g. I
am going to leave this evening.


In point 2, the definition is similar to, but, in fact, is different from "The Simple Futrue Tense". We use "be going to" when we are determined to take certain actions. The resolution is more stable than that of The Simple Future Tense, meaning that actions must be taken as planned.
The Present Perfect Tense

1. expressing actions started in the past while finishing talking or writing right now. (already, just)
   e.g. I've just finished my homework.

2. expressing things started in the past and continued up till now. (since, for)
   e.g. I
have lived here for 3 years. I have lived here since 1995. 
The Simple Past Tense

1. expressing actions in the past
   e.g. I
went to the park yesterday.
The Past Continuous Tense

1. expressing actions was taking place in a certain period in the past.  In Chinese(
�ʧ@���b�o�ͩ�L�h�Y�@�Ӯɶ���)
   e.g. We
were having lunch when John came.

This tense is usually used when the pattern is like the above example.
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