12．We should plant more trees every year，the more，the better．（改為被動語態(tài)）
More trees shouldbe planted every year，the more，the better．

分析 我們應(yīng)該每年種更多的樹，越多越好．
每年都應(yīng)該種更多的樹，越多越好．

解答 答案：be planted．主語more trees是動詞plant"種植"的承受者，構(gòu)成被動關(guān)系，前面有情態(tài)動詞should，故用情態(tài)動詞的被動語態(tài)---情態(tài)動詞+be+過去分詞，plant的過去分詞planted，故答案是be planted．

點評 此題要求把主動語態(tài)變?yōu)楸粍诱Z態(tài)，做這類題時，首先由原句的謂語確定采用哪種被動語態(tài)結(jié)構(gòu)，再看主語，二者結(jié)合即可得出答案．

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