18.Human population growth will be probably the most serious problem if itisn't controlled (not control) properly.

分析 人口的增長如果不適當(dāng)?shù)目刂,就可能是最?yán)重的問題.

解答 答案:isn't controlled.if引導(dǎo)的條件狀語從句,遵循主將從現(xiàn)的規(guī)則,故從句用一般現(xiàn)在時,結(jié)合not control用否定式,主語it替代Human population 是動詞control"控制"的承受者,構(gòu)成被動關(guān)系,故用一般現(xiàn)在時的被動語態(tài)am/is/are+過去分詞,主語it三單,故is,加上not縮寫成isn't,control的過去分詞是controlled,故答案是isn't controlled.

點評 一般現(xiàn)在時的被動語態(tài)am/is/are+過去分詞的呈現(xiàn),各種類型的被動語態(tài)的構(gòu)成要理解掌握.

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