How to use Present Perfect Tense

1. Using with the situation that happened in the past and continued to
the present.
          Example : Linda has studied Math for 2 years
               (ลินดาเรียนคณิตศาสตร์มา 2 ปีแล้ว ขณะนี้ก็ยังเรียนอยู่)

2. Apply to the situation that did not happen in the past and did not state the specific time and often contain the words ever , never , once , twice

          Example : I have never seen her before. (ฉันไม่เคยเห็นเธอมาก่อน)

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