Present Perfect Tense

Present Perfect Simple
Affirmative	Negative		Interrogative
	Long Form	Contracted Form
I have done	I have not done	I haven't done	Have I done?
You have done	You have not done	You haven't done	Have you done?
He/she/it has done	He/she/it has not done	He/she/it hasn't done	Has he/she/it done?
We have done	We have not done	We haven't done	Have we done?
You have done	You have not done	You haven't done	Have you done?
They have done	They have not done	They haven't done	Have they done?
Present Perfect Continuous
Affirmative	Negative		Interrogative
	Long Form	Contracted Form
I have been doing	I have not been doing	I haven't been doing	Have I been doing?
You have been doing	You have not been doing	You haven't been doing	Have you been doing?
He/she/has been doing	He/she/it has not  been doing	He/she/it hasn't been doing.	Has he/she/it been doing?
We have been doing	We have not been doing	We haven't been doing	Have we been doing?
You have been doing	You have not been doing	You haven't been doing	Have you been doing?
They have been doing	They have not been doing	They haven't been doing	Have they been doing?

The present perfect is used to refer to actions which take place in an
unfinished time period up to the time of speaking.

• The present perfect continuous tense is used to refer to an action
      which started in the past and continues today.
  • I have been learning English since September.
        (I started in September and I continue to take lessons today.)
  
  
• The present perfect simple is used to refer to the finished part of
      a continuous action.
  So far in my English course :
  • I have learnt new vocabulary.
  • I have revised some grammar rules.
        (My English course is not finished, but I have finished some of
         the lessons.)

Example:
Today is your English Revision day. It is now 2 p.m.
At 9 o'clock this morning you started your revision work. At 2 pm the day is not finished, so you can say :
"I have been revising my English since 9 o'clock this morning."
(You are still revising your English, so the continuous form is used.)

However, you have completed part of the revision work, so you can say,
for example:  "So far today I have revised tenses and irregular verbs."

N.B. 
If you refer to a specific time earlier in the day, you must use the Past Simple :
"This morning I revised tenses and irregular verbs." or,
"I met Charlie for lunch at 12.30"