หลักการใช้ Present Perfect Continuous Tense. 1. ใช้กับเหตุการณ์ที่เกิดขึ้นเรื่อย ๆ ตั้งแต่อดีตจนถึงปัจจุบัน เช่น. Lisa has been living in New York since 2004. ลิซ่าอาศัยอยู่ Present Perfect — since/‌for. Choose since or for from the drop-down menu. 1. They have lived here. since for. July. since. 2. She has been a teacher. for and since [month, time, year, phrase]+ action verbs. trigger the present perfect or the present perfect continuous. He has been here since yesterday. He has been playing the violin for three hours. He has played OR been playing the violin for three years. Action verbs can be either tense, depending on what you want to say. She has been cleaning the room since morning. Past Perfect Continuous Tense is used to express a past action which started in the past and continued to happen after another action or time in the past. Past Perfect Continuous Tense tell us “how long the action had continued” or ” the duration of the action” is emphasized more in this tense. Answers. 1. How long have you known Julie? 2. I have been working all morning. I am tired. 3. I have written ten letters since morning. 4. I have already received the report. 5. Sorry about the mess. yCpScUk.

present perfect continuous tense since for