語(yǔ)法一直是英語(yǔ)考試的框架，下面小編為備考的同學(xué)們整理了英語(yǔ)六級(jí)基礎(chǔ)語(yǔ)法知識(shí)，希望對(duì)大家有所幫助。 　　英語(yǔ)六級(jí)基礎(chǔ)語(yǔ)法：現(xiàn)在完成時(shí) 　　① 構(gòu)成：have / has 過(guò)去分詞 　　② 語(yǔ)法意義及要點(diǎn)： 　　A. 現(xiàn)在完成時(shí)表示一個(gè)過(guò)去開始的狀態(tài)或動(dòng)作持續(xù)到現(xiàn)在并可能繼續(xù)持續(xù)下去，常同表示一段時(shí)間的狀語(yǔ)連用。如so far, up to now, since, for a long time等。 　　--He has worked as a teacher for many years. 　　--Up till now, nothing has gone wrong. 　　B. 現(xiàn)在完成時(shí)表示一個(gè)過(guò)去發(fā)生的對(duì)現(xiàn)在仍有影響的動(dòng)作或事件。常與不確定的過(guò)去時(shí)間狀語(yǔ)連用，如yet, just, before, recently等;也同表示頻度時(shí)間狀語(yǔ)連用，如often, ever, never, sometimes, several times等;還可同包括現(xiàn)在時(shí)間在內(nèi)的時(shí)間狀語(yǔ)連用，如now, today, this morning等。但不能同特定的過(guò)去時(shí)間狀語(yǔ)連用(last year , in 1997等)。 　　--I have never learned Japanese before. 　　--We have been quite busy lately (recently). 　　C. 在時(shí)間或條件狀語(yǔ)從句中，當(dāng)表示將來(lái)完成時(shí)的意義時(shí)，要用現(xiàn)在完成時(shí)來(lái)代替將來(lái)完成時(shí)。 　　--We’ll start at 5 o’clock if it has stopped raining by then.

　　--I shall go to see you when I have finished my homework. 　　Note: 行為不能持續(xù)的瞬間動(dòng)詞(Instantaneous Verb), 如arrive, begin, come, go, start, leave, die, join等通常不能用于這一語(yǔ)法意義，即該類動(dòng)詞在現(xiàn)在完成時(shí)中不能與表示一段時(shí)間的狀語(yǔ)連用。 　　--He has joined the army for five years. (誤) 　　--He has been in the army for five years. (正)