1、“经常”常用的表达为：often; frequently; regularly; day-to-day。
2、“经常”还可以用英语表达为：everyday；half the time；often and often；at every turn；semper；evermore；regularity；oft-times；most an end。
3、双语例句：（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.