Usage: 
Perbuatan yang sedang terjadi saat ini.

Perbuatan yang akan datang tapi dalam waktu yang dekan (near future), misalnya nanti malam.

Patterns:

(+) S   + to be  + V-ing.
(-)  S   + to be not  + V-ing.
(? ) To be  +  S  + V-ing

Examples:

(+)  You are studying now.
(-)   You are not studying now.
(?)   Are you studying now?

Note  :

Continuous sering disebut juga Progressive.
Tidak semua kata kerja bisa dipakai dalam bentuk Continuous, misalnya  kata kerja yang berhubungan dengan:

* emosi (verbs of emotion): like, dislike, want, refuse
* indera (verbs of senses): see, hear, smell, taste, feel
* pikiran (verbs of thought/opinion): believe, expect, forget,  
   know, prefer, realize, understand, think (=mengira, kalau think =  
   berfikir boleh dalam bentuk Continuous)

  The simple present tense expresses habitual actions.

  Example: I eat breakfast every day at 7 A.M.

  The simple present tense expresses facts.

  Example: Winter begins on December 21.

  The present continuous describes action which is happening
  now or action which is temporary.
 
  It is formed by combining the present tense of the verb "be"
  with the present participle (the verb + "ing").

  Examples: 

  (open)  John is opening his book.  (now)
  (show)  The museum is showing a new exhibit this week.  (temporary)