句子的一个单词有错,应该是
It is often very hot during the months of July and August
of 属于词组 the months of 的一部分,
the months of July and August = 七月和八月的两个月份
during = 在...里,在...的时间里
during the months of July and August = 在七月和八月的两个月里
句子可以改写(不用of )为
It is often very hot during July and August
你说的没有 of 的句子就是上面这个句型.