以我在帮你回答问题为例:
一般现在时、Ihelpyouanswerthequestion.
现在进行时、Iamhelpingyouanswerthequestionnow.
一般将来时、Iwillhelpyouanswerthequestiontomorrow.
现在完成时、Ihavehelpedyouanswerthequestion.
一般过去时、Ihelpedyouanswerthequestion.
过去进行时、Iwashelpingyouanswerthequestionatthattime.
过去将来时、Iwasabouttohelpyouanswerthequestion.
过去完成时(又名过去过去时)、Ihadhelpedyouanswerthequestion.