sometimes 有时 When I want to watch a film,sometimes I go to the cinema and sometimes I use the Internet. always 一般,经常（一般情况下经常做某事） We always communicate with our friends via e-mails. often 经常（强调次数,基本与always通用） My family often go to a picnic at weekends. usually 通常（只做某件事通常用什么方法、通常在什么环境下等） I usually look for useful information through surfing the Internet .
