<html><p><img height="150" id="247" style="width: 124px; height: 113px;" alt="Image" src="http://www.e-exercises.com/img/bibliotheque/247_78b92786f45d7b00e0f503774e5628ac.jpg"> <span lang="EN-US" style='line-height: 115%; font-family: "Arial","sans-serif"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;'><strong>He'<span style="color: rgb(0, 0, 204);">d been waiting </span>for twenty minutes when his train arrived.</strong></span><br> </p></html>
<html><p><img height="150" id="247" style="width: 124px; height: 113px;" alt="Image" src="http://www.e-exercises.com/img/bibliotheque/247_78b92786f45d7b00e0f503774e5628ac.jpg"> <span lang="EN-US" style='line-height: 115%; font-family: "Arial","sans-serif"; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;'><strong>He'<span style="color: rgb(0, 0, 204);">d been waiting </span>for twenty minutes when his train arrived.</strong></span><br> </p></html>
=====Definition=====
=====Definition=====
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<html><p><strong><font face="arial">The past perfect continuous is a tense for talking about actions and activities in the past. In the same way that the <span style="color: rgb(112, 48, 160);">present perfect continuous</span> is connected to the present, the past perfect continuous is related to a point in the past.</font></strong></p> <p><strong></strong> </p></html>
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<html><p><strong><font face="arial">The past perfect continuous is a tense for talking about activities that started sometime in the past and continued up to a specified point in the past. <span style="color: rgb(112, 48, 160);"></span> </font></strong></p> <p><strong></strong> </p></html>