I ascertain you ascertain he ascertains we ascertain you ascertain they ascertain
Present continuous
I am ascertaining you are ascertaining he is ascertaining we are ascertaining you are ascertaining they are ascertaining
Preterite
I ascertained you ascertained he ascertained we ascertained you ascertained they ascertained
Preterite continuous
I was ascertaining you were ascertaining he was ascertaining we were ascertaining you were ascertaining they were ascertaining
Present perfect
I have ascertained you have ascertained he has ascertained we have ascertained you have ascertained they have ascertained
Present perfect continuous
I have been ascertaining you have been ascertaining he has been ascertaining we have been ascertaining you have been ascertaining they have been ascertaining
Pluperfect
I had ascertained you had ascertained he had ascertained we had ascertained you had ascertained they had ascertained
Pluperfect continuous
I had been ascertaining you had been ascertaining he had been ascertaining we had been ascertaining you had been ascertaining they had been ascertaining
Future
I will ascertain you will ascertain he will ascertain we will ascertain you will ascertain they will ascertain
Future continuous
I will be ascertaining you will be ascertaining he will be ascertaining we will be ascertaining you will be ascertaining they will be ascertaining
Future perfect
I will have ascertained you will have ascertained he will have ascertained we will have ascertained you will have ascertained they will have ascertained
Future perfect continuous
I will have been ascertaining you will have been ascertaining he will have been ascertaining we will have been ascertaining you will have been ascertaining they will have been ascertaining
Conditional
Present
I would ascertain you would ascertain he would ascertain we would ascertain you would ascertain they would ascertain
Present continuous
I would be ascertaining you would be ascertaining he would be ascertaining we would be ascertaining you would be ascertaining they would be ascertaining
Past
I would have ascertained you would have ascertained he would have ascertained we would have ascertained you would have ascertained they would have ascertained
Past continuous
I would have been ascertaining you would have been ascertaining he would have been ascertaining we would have been ascertaining you would have been ascertaining they would have been ascertaining