since過(guò)去某個(gè)時(shí)間點(diǎn)的句子,時(shí)態(tài)都是現(xiàn)在完成時(shí).給你看幾個(gè)例句吧：
The real estate market in Britain has been very hot since last year when the annual rate of increase in housing prices exceeded 10%.
英國(guó)房地產(chǎn)市場(chǎng)從去年以來(lái)一直十分活躍,去年全年房?jī)r(jià)漲幅超過(guò)10%.
Great progress has been made in medical work since liberation.
自解放以來(lái),醫(yī)藥事業(yè)取得了巨大的進(jìn)步.
Great progress has been made since the beginning of the pilot project and the implementation of the six key programs.
六大工程建設(shè)從試點(diǎn)和啟動(dòng)以來(lái),取得重要進(jìn)展.