現(xiàn)在完成時(shí)

1.概念：過(guò)去發(fā)生或已經(jīng)完成的動(dòng)作對(duì)現(xiàn)在造成的影響或結(jié)果，或從過(guò)去已經(jīng)開(kāi)始，持續(xù)到現(xiàn)在的動(dòng)作或狀態(tài)。

2.時(shí)間狀語(yǔ)：yet,already,just,never,ever,so far,by now,since+時(shí)間點(diǎn)，for+時(shí)間段，recently, lately, in the past few years, etc.

3.基本結(jié)構(gòu)：主語(yǔ)+have/has +p.p（過(guò)去分詞）+其他

4.否定形式：主語(yǔ)+have/has + not +p.p（過(guò)去分詞）+其他

5.一般疑問(wèn)句：have或has。

6.例句：I've written an article.

? ? ? ? ? ?The countryside has changed a lot in the past few years.