根據(jù)句意,用所給動(dòng)詞的適當(dāng)形式填空。
小題1:We will have a picnic on May Day if it _______(not rain).
小題2:He ______ (wash) his car when I went to visit him yesterday.
小題3:We are all working hard ______(realize)the China’s Dream.
小題4:In the past few weeks, many special things _________(take) place in the world.
小題5:As we all know PM2.5 ________(cause) by air pollution in some parts of the country.

小題1:doesn’t
小題2:was washing
小題3:to realize
小題4:have taken
小題5:is caused

試題分析:
小題1:當(dāng)主句描述將來動(dòng)作時(shí),英語條件狀語從句用用一般現(xiàn)在時(shí)態(tài)表示將來動(dòng)作。從句主語it是單數(shù)第三人稱,故填doesn’t。
小題2:根據(jù)下文時(shí)間狀語從句when I went to visit him yesterday ,可知主句描述的是過去某時(shí)正在進(jìn)行的動(dòng)作,故用過去進(jìn)行時(shí)態(tài)。主語He是第三人稱,故be動(dòng)詞用was,填:was washing。
小題3:動(dòng)詞不定式做目的狀語表示具體的將要進(jìn)行的動(dòng)作,故填:to realize
小題4:根據(jù)前文時(shí)間狀語In the past few weeks,可知本句描述的是現(xiàn)在已經(jīng)完成的動(dòng)作,故用現(xiàn)在完成時(shí)態(tài)。填:have taken。
小題5:句意:眾所周知,在國(guó)家某些地方,PM2.5是由空氣污染造成的。結(jié)合語境可知本句描述的是客觀性事實(shí),故用一般現(xiàn)在時(shí)態(tài)。主語PM2.5表示抽象含義,故be動(dòng)詞用單數(shù)。主語是動(dòng)作對(duì)象,故用被動(dòng)語態(tài),填:is caused。
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