2) Even after worked in the office /for as many as fifteen years /he still does not even understand /the basic objectives of the work. I searched it and found some information written below :- (the word 'after' negates that continuous aspect, for me. If you use 'after' then the action must be completed, not still continuing,) What you have here is the perfect form of the present participle It denotes continuous work during those 15 years, "After" means prior to the present time.
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NakoolThe above highlighted in Bold are the sentences.I know, but we ask the poster to make the changes that the teacher or grammar book requests first. After you try to get the answer, then we will help you.