1)in the morning 泛指早上较长的一段时间,而on the morning 指确切的某一个早上。如:
I often do exercise in the morning.
I was born on the morning of March 1st in 1978.
2)in the morning on May 1与on the morning of May 1的区别:
意思都是“五月一日上午”
in the morning on May 1是纯粹的时间从小到大的排序
on the morning of May 1中"of May 1" 是以介词短语的形式作后置定语,修饰mornimg
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