I am summing you are summing he is summing we are summing you are summing they are summing
Preterite
I summed you summed he summed we summed you summed they summed
Preterite continuous
I was summing you were summing he was summing we were summing you were summing they were summing
Present perfect
I have summed you have summed he has summed we have summed you have summed they have summed
Present perfect continuous
I have been summing you have been summing he has been summing we have been summing you have been summing they have been summing
Pluperfect
I had summed you had summed he had summed we had summed you had summed they had summed
Pluperfect continuous
I had been summing you had been summing he had been summing we had been summing you had been summing they had been summing
Future
I will sum you will sum he will sum we will sum you will sum they will sum
Future continuous
I will be summing you will be summing he will be summing we will be summing you will be summing they will be summing
Future perfect
I will have summed you will have summed he will have summed we will have summed you will have summed they will have summed
Future perfect continuous
I will have been summing you will have been summing he will have been summing we will have been summing you will have been summing they will have been summing
Conditional
Present
I would sum you would sum he would sum we would sum you would sum they would sum
Present continuous
I would be summing you would be summing he would be summing we would be summing you would be summing they would be summing
Past
I would have summed you would have summed he would have summed we would have summed you would have summed they would have summed
Past continuous
I would have been summing you would have been summing he would have been summing we would have been summing you would have been summing they would have been summing