This cold is nothing compared to what I have experienced in Russia.
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AnonymousCould you explain why?It is the statement of past life experience, which is one of the functions of present perfect simple aspect.
Anonymous I have to use 'had' to indicate a certain chronological point the event ceased to happenNo, that is not the function of past perfect. Past perfect is used for the earlier of two past events whose chronological order is not otherwise clear in the text.