The difference between the past and the past is that the meaning of the past is richer, and the parts of speech of the two words are also different. The past is a verb, the past is a noun, the past is only a description of the past, including the comparison between the present and the past.
Past means the time that has gone before; There are four meanings in the past. One is the future time, the other is the place that has passed before, the third is the number, and the fourth is the previous time.
In terms of word meaning, the meaning of the past is richer than that of the past. In part of speech, the past is a noun, representing the past, but the past is a verb, representing what has been done or experienced before.
The last difference is that the past describes the previous appearance, but does not refer to what it will look like in the future. The past is to emphasize that the present appearance is different from the previous appearance, including the comparison between the present and the past.