不要这样思考念枣拦。要根据说话时(表达时)的情况,具体来定:下面都对
I'm having a great(或good) time. [面对面或电话上对人说:我(在这儿)仔胡过得很愉快。]
I had a great(或good) time. [平常地表述:(这段时间)我(在这儿)过得很愉快。]
I have had a great(或good) time. [强调:(这段时间)我(一直)过得很愉快。]
I (often\always\usually) have a great(或good) time. [一般表述:我(经常、总是【一直】、通岩粗常)过得很愉快。]