過去完成時(shí)與現(xiàn)在完成時(shí)的區(qū)別

過去完成時(shí)與already，ever，just，never，“since＋時(shí)間點(diǎn)”，“for＋時(shí)間段”等連用時(shí)，強(qiáng)調(diào)事件發(fā)生的先后順序，不涉及現(xiàn)在的情況。現(xiàn)在完成時(shí)強(qiáng)調(diào)的是“過去的動(dòng)作或狀態(tài)對(duì)現(xiàn)在造成的影響”。如：

She has worked in Chongqing for over two years.她已經(jīng)在重慶工作兩年多了。(現(xiàn)在仍在那兒工作)

She had worked in Chongqing for over two years before she moved to Shanghai.她在搬到上海之前已經(jīng)在重慶工作兩年多了。(“搬到上海”是過去，“在重慶工作”發(fā)生在過去的過去)

He has never seen such an interesting film before.他以前從未看過這么有趣的電影。(“看”盡管發(fā)生在過去，但涉及現(xiàn)在，即現(xiàn)在已經(jīng)知道或了解了這部電影)

He said he had never seen such an interesting film before.他說他以前從沒看過這么有趣的電影。(“他說”發(fā)生在過去，“看過”是在“說”之前，是過去的過去)