1楼的时态不对,最好改成:The People's Republick of China has been established since 1949.因为用一般过去时,不接since引导的时间状语.而用现在完成时,却能很好地表达句意.并且也能接since引导之时间状语.--------上面还有一个错误,就是establish是非延续性动词,不能用for/since引导时间状语.所以正确的是:The People's Republick of China has started since 1949. 或者用一般现在时,The People's Republick of China was established in 1949.
