http://www.learnenglishfeelgood.com/vocabulary/esl-talking-about-work1.html
Present perfect
http://www.gingersoftware.com/content/grammar-rules/verbs/the-present-perfect-simple-tense/
started in the past and still continues (true continuous and repeated)
- for and since
experience
- no time or details
for examples
http://www.englishpage.com/verbpage/presentperfect.html
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