I____(try)to call for a taxi for almost an hour but Ihave failed
答案：have been trying
在這里 for almost an hour是段時(shí)間 而try是瞬間動詞 只有用其的完成進(jìn)行時(shí)表示持續(xù)的狀態(tài)
She told me ever since then she____(live)in that small town,____(enjoy)a quiet life
答案：had been living:enjoying
譯文：她說自那時(shí)她就一直住在那個(gè)小鎮(zhèn)里,享受著安逸的生活.
had been living現(xiàn)在完成進(jìn)行時(shí)：表示從過去某時(shí)開始一直持續(xù)到現(xiàn)在的動作,并且還將持續(xù)下去.通俗一點(diǎn)說.某個(gè)動作,發(fā)生在過去,具體什么時(shí)候不知道,但到目前為止,是做過了的,這就是現(xiàn)在完成時(shí).某個(gè)動作,過去就已經(jīng)發(fā)生,而且到了現(xiàn)在還沒有中止,還在做,這就是現(xiàn)在完成進(jìn)行時(shí).現(xiàn)在完成進(jìn)行時(shí)表示動作現(xiàn)在仍在繼續(xù)．并將延續(xù)下去,現(xiàn)在完成時(shí)的動作是否延續(xù)下去,須由上下文決定.這道題說她自從那時(shí)就住在這兒了.那很明顯可以看出住得動作現(xiàn)在還在繼續(xù),并將延續(xù)下去.enjoying是現(xiàn)在分詞做伴隨狀語,表示伴隨的狀態(tài).懂了么?
參考：
ever since then要注意since結(jié)構(gòu)的用法,ever起強(qiáng)調(diào)作用.since引起的時(shí)間狀語或從句,主句謂語動詞要用完成時(shí).如：
He had spoken to her only once since the party.
從那次舞會后,他只跟她說過一句話.
Ever since I was at school,I have never been to the cinema.
自從上學(xué)后,我再也沒有看過電影.