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From for Since

Don't say He has been ill from last Friday




say He has been ill since last Friday

The preposition 'since' is placed before words or phrases denoting a point of time :as , 'since Christmas'. When ;since' is used, the verb is usually in the present perfect tense, but it may be in the past perfect: as , 'I was glad to see Tom. I had not seen him since last Christmas" .