纯动词原形就是现在时态 I love my girl friend ! V+ed/动词过去式 是一般过去时态 I loved you ! will+V原形/be going to 是一般将来时 I will go to school. have/has+done(动词过去分词)现在完成时 I have finished my homework. She has finished her homework. had+done(动词过去分词)过去完成时 I had finished my homework. 还有现在完成时的标志性词语:ever,never,since,already,yet,before.twice,once ,three times.