这四个词意思相近。它们的区别是: 1.表示的频率不同。例如: He comes to school on Monday,Tuesday,Wednesday,Thursday,Friday,Saturday and even on Sunday.我们可说:He always goes to school.always表示的频率是100%。 He comes to school on Monday,Tuesday,Wednesday,Thursday and Friday.我们可说:He usually goes to school.usually表示的频率是90%。 He comes to school on Monday,Tuesday,Wednesday and Thursday.我们可说:He often goes to school.often表示的频率是60%。 He comes to school on Monday and Thursday.我们可以说He sometimes goes to school.sometimes表示的频率是20%。 2.always的反义词是never; often的反义词是seldom; usually的反义词是occasionally, sometimes的反义词是always。
often, frequently
这两个词都可表示“经常”。它们的区别是: often是常用词,强调的是经常性,具体时间意味不强; frequently比较正式,强调在某一具体时间内某事一次接一次地发生。试比较: He comes here very often. 他经常来这儿。 He comes here very frequently. 他来这儿很频繁。