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①I haven't seen Justin since.
②Detective Sam Peterson,who has taken charge of the case,told journalists,‘Sometimes people make up such amazing stories...’
③From our recent survey of students,we have found that 53 per cent of the students often play sports.
④For centuries,people have reported seeing a wild creature in the Himalayas called Yeti.
⑤Large tracks have also been discovered which some people say belong to the Wild Man.
⑥This incident has received great interest due to reports of strange lights in the sky and of alien visits around the time the boy disappeared.
⑦I've been writing the composition for two hours,but I haven't finished it yet.
⑧I have been wanting to meet you for a long time.
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1.句①~⑥中均運(yùn)用了現(xiàn)在完成時(shí),其謂語動(dòng)詞的構(gòu)成形式為:have/has+過去分詞。
2.句⑦⑧運(yùn)用了現(xiàn)在完成進(jìn)行時(shí),其謂語動(dòng)詞的構(gòu)成形式為:have/has+been+現(xiàn)在分詞,表示過去發(fā)生的動(dòng)作一直持續(xù)到現(xiàn)在。
3.現(xiàn)在完成時(shí)有兩個(gè)基本用法:一是表示過去發(fā)生的動(dòng)作對(duì)現(xiàn)在造成的影響或結(jié)果,如句②③⑤⑥;二是表示過去開始的動(dòng)作一直持續(xù)到現(xiàn)在,并且有可能繼續(xù)下去,如句①④。
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