His classmates have observed Tom make trouble in every possible way in the classroom．Tomhasbeenobservedto make trouble in every possible way in the classroom．题目和参考答案——青夏教育精英家教网—

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11．His classmates have observed Tom make trouble in every possible way in the classroom．
Tomhasbeenobservedto make trouble in every possible way in the classroom．

分析 Tom的同学都注意到了Tom总是在教室里惹麻烦．

解答答案：has been observed to．
分析句子的结构可知，在第一句中Tom make trouble in every possible way in the classroom为一个宾语从句；而在第二个句子中，Tom成了句子的主语，所以他的行为应该是已经被同学们观察到了，所以使用现在完成时的被动结构；故答案为has been observed to．

点评对于句型转换的题目要分析原句的句型结构，并找出同义句型或者相同意思的表达方式，或者使用非谓语动词的形式，或者从句的形式以及一些特殊句式等，要根据句式结构特点进行灵活选择．

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