Present Tense structure and definition / Present tense classification

Present Tense Structures,classification

 

 

 

 Present Tense structure and definition / Present tense classification.

              
     Tense's Definition:

 Shortly, tense is the time of producing work. When a subject does something, he/she maintains a period of time. It may be finished or being now or may happen next. For example, " 1. Lima do a work. 2. Lima did a work. 3. Lima will do a work"

                Here, we find three periods of time. In first sentence, we know that Lima does her work daily. To the next, she did it in the past and in the last sentence, we know that she will do the work next time.

  From this example,we find three segments of time, 1. Present. 2. Past. 3. Future.
* These three parts can be divided into four sub-parts. They are: 

1. Indefinite.
2. Continuous.
3. Perfect.
4. Perfect Continuous.


( NOTE: V1= Present,V2= Past,V3= Past Participle, Sub= Subject,Obj= object,V= Verb,Ext= Extension )
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Present Tense :

1. Present Indefinite: 

Something that always happens or universal truth.

                     STRUCTURE: sub+V1+obj.
                                            e.g: She writes a letter.
                                                    I go to school.
(note: s/es will be added with verb if the subject is third person and singular number.)

 

 2. Present Continuous: 

Something that is happening now. 

                               STRUCTURE: sub+am/is/are+V1+ing+obj.
                                                     e.g. She is writing a letter.
                                                    I am going to school.

3. Present Perfect: 

Something that has happened just now but it's result isn't found yet. 
                               STRUCTURE: sub+have/has+V3+obj.

                                                          e.g. She has written a letter.
                                                           I have gone to school.

4. Present Perfect Continuous:

 Something that is happening for sometime.

                               STRUCTURE: sub+have  been/has been +V1+ing+obj+for/since/from+ext.
                                                   e.g. She has been writing a letter for one hour.
                                                  I have been going to school for three hours.
            (note: For is added if there is a number,e.g. three days/two hours)