I doubt you doubt he doubts we doubt you doubt they doubt
Present continuous
I am doubting you are doubting he is doubting we are doubting you are doubting they are doubting
Preterite
I doubted you doubted he doubted we doubted you doubted they doubted
Preterite continuous
I was doubting you were doubting he was doubting we were doubting you were doubting they were doubting
Present perfect
I have doubted you have doubted he has doubted we have doubted you have doubted they have doubted
Present perfect continuous
I have been doubting you have been doubting he has been doubting we have been doubting you have been doubting they have been doubting
Pluperfect
I had doubted you had doubted he had doubted we had doubted you had doubted they had doubted
Pluperfect continuous
I had been doubting you had been doubting he had been doubting we had been doubting you had been doubting they had been doubting
Future
I will doubt you will doubt he will doubt we will doubt you will doubt they will doubt
Future continuous
I will be doubting you will be doubting he will be doubting we will be doubting you will be doubting they will be doubting
Future perfect
I will have doubted you will have doubted he will have doubted we will have doubted you will have doubted they will have doubted
Future perfect continuous
I will have been doubting you will have been doubting he will have been doubting we will have been doubting you will have been doubting they will have been doubting
Conditional
Present
I would doubt you would doubt he would doubt we would doubt you would doubt they would doubt
Present continuous
I would be doubting you would be doubting he would be doubting we would be doubting you would be doubting they would be doubting
Past
I would have doubted you would have doubted he would have doubted we would have doubted you would have doubted they would have doubted
Past continuous
I would have been doubting you would have been doubting he would have been doubting we would have been doubting you would have been doubting they would have been doubting