For and Since with Present Perfect

By in Grammar on September 1, 2016

Please choose the correct preposition for a meaningful sentence.

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1. We usually use since to express the exact starting point of an event (last year1996I arrived…).

2. The prepositions for and since have the same connotation but different general purpose.

3. We usually use for to express the period of time in which an event took place (2 years6 weeks10 days…). The event expressed with for is still effective in the present time of the conversation.