Sam is very active and does exercises every day.这句话哪个地方出错了?
问题描述：
Sam is very active and does exercises every day.这句话哪个地方出错了?
答
1.改正：exercises → exercise.
2.固定短语do exercise意思是“锻炼”,其中的exercise是不可数名词.
而do exercises意思是“做练习题”.
3.如果是“做早操”则为：do morning exercises；
“做眼保健操”是do eye exercises.