-What are you going to do this Sunday?
-I ________ yet.
A.won't decideB.didn't decideC.haven't decidedD.don't decide
C

試題分析:現(xiàn)在完成時(shí)用來(lái)表示之前已發(fā)生或完成的動(dòng)作或狀態(tài),其結(jié)果的確和現(xiàn)在有聯(lián)系。動(dòng)作或狀態(tài)發(fā)生在過(guò)去 但它的影響現(xiàn)在還存在;也可表示持續(xù)到現(xiàn)在的動(dòng)作或 狀態(tài)。其構(gòu)成: have (has) +過(guò)去分詞。根據(jù)語(yǔ)境可知此句的含義是我還沒(méi)決定,因主語(yǔ)是I,故用助動(dòng)詞have not+過(guò)去分詞,故選C.
點(diǎn)評(píng): 注意現(xiàn)在完成時(shí)和一般過(guò)去時(shí)兩種時(shí)態(tài)的區(qū)分
(1)一般過(guò)去時(shí)的謂語(yǔ)動(dòng)詞用過(guò)去式,而現(xiàn)在完成時(shí)的謂語(yǔ)基本構(gòu)成是"助動(dòng)詞have /has +過(guò)去分詞"。 (2)一般過(guò)去時(shí)通常與表示過(guò)去的時(shí)間狀語(yǔ)連用。如:yesterday, last week, two years ago, just now, in 2002等; 而現(xiàn)在完成時(shí)則常與just, already, ever, never等副詞和these days, this week, since..., for...等表示一段時(shí)間的狀語(yǔ)連用。
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