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动词不定式的完成时和完成进行时是什么意思?

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动词不定式的完成时和完成进行时是什么意思?
to have done是动词不定时的完成时.have been doing 就是完成进行时. 1、强调动作在一段时间内反复发生.
  We have been seeing quite a lot of each other recently.
  最近我们常常见面.
  Where have you been? We have been looking for you everywhere.
  你刚才在哪儿?我们一直在到处找你呢!
  He has been saying that for years.
  这话他已经说了好几年了.
  It has been raining every day this month.
  这个月天天下雨.
  2、强调动作在长时间内持续不断.
  All these years they have been contributing articles to our magazine.
  这些年来,创立们一直为我们杂志写稿.
  She has been writing the letter since four o”clock in the afternoon.
  从下午四点钟到现在,她一直在写信.
  We have been studying in this school for three years.
  我们一直在这所学校学习了三年.
  How long have you been watching TV?
  你看了多久电视了?