-You can use this tense when you want speak about actions which started in the past and continue now.
-To form this tense you have to use the auxiliary have and has for third people more the verb in past participle.
Example:
- I have had this gloves since last year
- I have lived in Bogota for ten years
- Since last summer She hasn't been her family
- For ten months I have been nurse in the hospital Simon Bolivar
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/upperf1.htm
http://www.eclecticenglish.com/grammar/PresentPerfect1D.html
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