I stem you stem he stems we stem you stem they stem
Present continuous
I am stemming you are stemming he is stemming we are stemming you are stemming they are stemming
Preterite
I stemmed you stemmed he stemmed we stemmed you stemmed they stemmed
Preterite continuous
I was stemming you were stemming he was stemming we were stemming you were stemming they were stemming
Present perfect
I have stemmed you have stemmed he has stemmed we have stemmed you have stemmed they have stemmed
Present perfect continuous
I have been stemming you have been stemming he has been stemming we have been stemming you have been stemming they have been stemming
Pluperfect
I had stemmed you had stemmed he had stemmed we had stemmed you had stemmed they had stemmed
Pluperfect continuous
I had been stemming you had been stemming he had been stemming we had been stemming you had been stemming they had been stemming
Future
I will stem you will stem he will stem we will stem you will stem they will stem
Future continuous
I will be stemming you will be stemming he will be stemming we will be stemming you will be stemming they will be stemming
Future perfect
I will have stemmed you will have stemmed he will have stemmed we will have stemmed you will have stemmed they will have stemmed
Future perfect continuous
I will have been stemming you will have been stemming he will have been stemming we will have been stemming you will have been stemming they will have been stemming
Conditional
Present
I would stem you would stem he would stem we would stem you would stem they would stem
Present continuous
I would be stemming you would be stemming he would be stemming we would be stemming you would be stemming they would be stemming
Past
I would have stemmed you would have stemmed he would have stemmed we would have stemmed you would have stemmed they would have stemmed
Past continuous
I would have been stemming you would have been stemming he would have been stemming we would have been stemming you would have been stemming they would have been stemming