Question

3．-Before exams，studentsare always told to try to avoid making mistakes that they made beforeby teachers．（老师们总是告诫学生尽量避免犯以前犯过的错误）（avoid）
-Oh，it's hard to do that．

Answer 1

分析 ---考试前，老师们总是告诫学生尽量避免犯以前犯过的错误．
---很难做到．

解答 答案：are always told to try to avoid making mistakes that they made before．这里是表示经常always的动作，用一般现在时，告诫某人做某事tell sb do sth，主语students是动词tell的承受者，故用一般现在时的被动语态am/is/are+过去分词，tell的过去分词是told，改为被动语态的时候需加上动词不定式符号，故be told to do sth，主语students复数，故are，尽力做某事try to do sth，避免做某事avoid doing sth，犯错make mistakes，故are always told to try to avoid making mistakes，mistakes作为先行词，植物，用关系词that引导的定语从句，之前犯的错误表示的是过去的事情用一般过去时，make的过去式made，故 that they made before，故答案是are always told to try to avoid making mistakes that they made before．

点评 在make，let，have等使役动词和see，watch，notice，hear，feel等感官动词后的复合宾语中，动词不定式不带to．