meaning - Present Perfect Vs Present Perfect Continuous and Simple Past/ Past Perfect Vs Past Perfect Continuous



What is the difference in meanings of the following pairs of sentences? It's very confusing to me.





  1. a. I have lived in Paris for 4 years.
    b. I have been living in Paris for 4 years.




  2. a. I lived in Paris for 4 years.
    b. I had lived in Paris for 4 years.




  3. a. I had lived in Paris for 4 years.
    b. I had been living in Paris for 4 years.





Will there be any difference in meanings if I do not write "for 4 years" in each of the above sentences?




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