定语从句一般都是紧跟在先行词的后面,你这个算是简单一点的句子,假设稍微复杂一点,或者容易产生歧义的句子就不好办了,如：Peter saved the drowning boy ,whom people used to think was not brave.像这个句子就容易产生歧义了,到底是谁被人们看成是不勇敢呢?如果改成Peter ,whom people used to think was not brave,saved the drowning boy .
所以选第二种改法.
将两个句子改为非限制性定语从句Peter danced and sang all evening.People used