我对英语的时态总是不明白比如比如I am eat dinner ,这句话怎样来变换它的时态呢

一般现在时：we often eat dinner 一般过去时：we ate dinner at 8 o'clock yesterday. 一般将来时：we will have dinner at 8 o'clock tonight. 过去进行时：we were having dinner when my friend came 现在完成时：we have eaten three apples since this morning. 过去完成时：we had eaten our dinner when my parents got home. 过去将来时：our boss told us that he would have dinner with us tonight. had done这种形式是过去完成时，一般是发生在过去时间的过去，翻译成“我已经吃过饭了”