B- Tense also indicates whether the action denoted by the verb is:

Simple.                  Continuous.                               Completed.

All the tenses have four forms:

1.     The simple.

2.     The continuous.

3.     The perfect.

4.     The perfect continuous.

The term "perfect", meaning "finished" or "over" is more often need than completed.

The term "imperfect" meaning "not finished" "still going on" is often used as a synonym for continuous.

Let us have a look at the present tense.

As you know, the present tense speaks of something happening now, or in the present. This tense if further divided into:

1) Present Simple:                            I play the piano.  

2) Present Continuous:                    I'am going to school. 

3) Present Perfect:                           I have eaten my dinner. 

4) Present Perfect Continuous:        I have been studying hard.

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