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【題目】句型轉換。
（1）The hungry boy ate up all the food on the plate. (變?yōu)楸粍诱Z態(tài)）
All the food on the plate up by the hungry boy.
（2）Mary bought a new car two weeks ago. (用完成時態(tài)改寫）
Mary a new car for two weeks.
（3） you work hard, you will fall behind your classmates.

【答案】
（1）was,eaten
（2）has,had
（3）Unless
【解析】（1）主動語態(tài)變?yōu)楸粍诱Z態(tài)，結構為be+過去分詞。主語發(fā)生變化，此處主語是the food，不可數名詞，句子為一般過去時，故be動詞用was。在被動語態(tài)中用動詞eat的過去分詞形式eaten。故填was，eaten.
（2）現在完成時態(tài)結構為have/has +done sth，主語是第三人稱單數，因此用has。bought是瞬間動作，在完成時中必須改成表示持續(xù)性動作的動詞，have，過去分詞為had，故填has，Had。
（3）句意：如果你不努力，就會落后于別人。根據句意，可知此處應該是缺少了“如果……不”，用Unless 引導，故填unless.

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