I certify you certify he certifies we certify you certify they certify
Present continuous
I am certifying you are certifying he is certifying we are certifying you are certifying they are certifying
Preterite
I certified you certified he certified we certified you certified they certified
Preterite continuous
I was certifying you were certifying he was certifying we were certifying you were certifying they were certifying
Present perfect
I have certified you have certified he has certified we have certified you have certified they have certified
Present perfect continuous
I have been certifying you have been certifying he has been certifying we have been certifying you have been certifying they have been certifying
Pluperfect
I had certified you had certified he had certified we had certified you had certified they had certified
Pluperfect continuous
I had been certifying you had been certifying he had been certifying we had been certifying you had been certifying they had been certifying
Future
I will certify you will certify he will certify we will certify you will certify they will certify
Future continuous
I will be certifying you will be certifying he will be certifying we will be certifying you will be certifying they will be certifying
Future perfect
I will have certified you will have certified he will have certified we will have certified you will have certified they will have certified
Future perfect continuous
I will have been certifying you will have been certifying he will have been certifying we will have been certifying you will have been certifying they will have been certifying
Conditional
Present
I would certify you would certify he would certify we would certify you would certify they would certify
Present continuous
I would be certifying you would be certifying he would be certifying we would be certifying you would be certifying they would be certifying
Past
I would have certified you would have certified he would have certified we would have certified you would have certified they would have certified
Past continuous
I would have been certifying you would have been certifying he would have been certifying we would have been certifying you would have been certifying they would have been certifying