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[quote=David L.;271945]In those sentences, you have not used a 'finished time expression'

since 1985 : the intervening time period between 1985 and now.

for 10 years : for the specified period of time of 10 years. 'He went to prison in 1985 for 10 years'.

Thanks David,

I realized it after i wrote these sentences. However, I often read and listen to sentences like this: " We are pleased to tell you that we have received your payment on 19th Mar , 2008."
Another e.g. " Last year alone, we've made great strides ----."Are these incorrect? Or would it be more correct to say, the present perfect is 'occassionally used with a finished time expression?'

Arun