I back you back he backs we back you back they back
Present continuous
I am backing you are backing he is backing we are backing you are backing they are backing
Preterite
I backed you backed he backed we backed you backed they backed
Preterite continuous
I was backing you were backing he was backing we were backing you were backing they were backing
Present perfect
I have backed you have backed he has backed we have backed you have backed they have backed
Present perfect continuous
I have been backing you have been backing he has been backing we have been backing you have been backing they have been backing
Pluperfect
I had backed you had backed he had backed we had backed you had backed they had backed
Pluperfect continuous
I had been backing you had been backing he had been backing we had been backing you had been backing they had been backing
Future
I will back you will back he will back we will back you will back they will back
Future continuous
I will be backing you will be backing he will be backing we will be backing you will be backing they will be backing
Future perfect
I will have backed you will have backed he will have backed we will have backed you will have backed they will have backed
Future perfect continuous
I will have been backing you will have been backing he will have been backing we will have been backing you will have been backing they will have been backing
Conditional
Present
I would back you would back he would back we would back you would back they would back
Present continuous
I would be backing you would be backing he would be backing we would be backing you would be backing they would be backing
Past
I would have backed you would have backed he would have backed we would have backed you would have backed they would have backed
Past continuous
I would have been backing you would have been backing he would have been backing we would have been backing you would have been backing they would have been backing