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)目刂疲涂赡苁亲顕?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(shí)，結(jié)合not control用否定式，主語it替代Human population 是動(dòng)詞control"控制"的承受者，構(gòu)成被動(dòng)關(guān)系，故用一般現(xiàn)在時(shí)的被動(dòng)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(diǎn)評(píng) 一般現(xiàn)在時(shí)的被動(dòng)語態(tài)am/is/are+過去分詞的呈現(xiàn)，各種類型的被動(dòng)語態(tài)的構(gòu)成要理解掌握．

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