经常的英文高级表达有：often, frequently, regularly, day-to-day, everyday, half the time, often and often, at every turn, semper, evermore, regularity, oft-times, most an end等。这些表达可以用于描述一个人或事物经常发生的情况。例如：
1. 他经常上图书馆去。He often goes to the library。
2. 这类问题是经常发生的。This kind of problem frequently crops up。
3. 我掌握了大量关于这类事的最新信息，因为我经常收听新闻。I am very up to date on this sort of thing because I listen to the news。