一般现在时：often,usually,always,sometimes,every day,never,sldom等频度副词。注意：every day合在一块写是形容词！

一般过去时：ago,yesterday,last,just now等短语

现在进行时：now,at this moment,these days,at present,right now,at this moment

现在完成时：already,yet,now,just,by this time,today,this morning,this week,recently,lately,since then,often,(ever)since,before,ever

过去完成时很多都是短语

过去进行时：then,at that time,this time yesterday

一般将来时：next time,tomorrow,in the future

有很多词可以用在很多不同的时态，需要根据文章来定。