I am writing a summary for last year and I have just realized that I do not know what tense to use in the following situation: Since 2009 I have been developing a computer program. As I am describing what I was working on last year, what tense should I use? I think I cannot use simple past tense because I am still working on that. I also think I cannot use present perfect because the description will relate to period of time that passed. Could anyone help me on this? Thank you
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If your summary focuses on what happened in 2011, but you are still working on the computer program now, then you could write something like this: "I continued working on the computer program which I started developing in 2009."
That looks right to me, you're using the present perfect continuous tense. I would move since 2009 to the end of the sentence though: I have been developing a computer program since 2009 feels more natural to me.