Funny question that and depends how you look at it.
I say 2 past and present.
You could say that there s Past simple, Past perfect, Past Contnuous and the list goes on.
There are future tenses but as a English teacher I wasn't taught them and I don 't know why. Miost tenses used for the future use present tense - I will/ I am going. I will wach one of our gurus answer
Sorry Mr M. We started to answer this post at the same time. I wanted to come back and edit after seeing you had answered but then my PC crashed, hence the statement about waiting for one of you gurus to answer this.