I crumble you crumble he crumbles we crumble you crumble they crumble
Present continuous
I am crumbling you are crumbling he is crumbling we are crumbling you are crumbling they are crumbling
Preterite
I crumbled you crumbled he crumbled we crumbled you crumbled they crumbled
Preterite continuous
I was crumbling you were crumbling he was crumbling we were crumbling you were crumbling they were crumbling
Present perfect
I have crumbled you have crumbled he has crumbled we have crumbled you have crumbled they have crumbled
Present perfect continuous
I have been crumbling you have been crumbling he has been crumbling we have been crumbling you have been crumbling they have been crumbling
Pluperfect
I had crumbled you had crumbled he had crumbled we had crumbled you had crumbled they had crumbled
Pluperfect continuous
I had been crumbling you had been crumbling he had been crumbling we had been crumbling you had been crumbling they had been crumbling
Future
I will crumble you will crumble he will crumble we will crumble you will crumble they will crumble
Future continuous
I will be crumbling you will be crumbling he will be crumbling we will be crumbling you will be crumbling they will be crumbling
Future perfect
I will have crumbled you will have crumbled he will have crumbled we will have crumbled you will have crumbled they will have crumbled
Future perfect continuous
I will have been crumbling you will have been crumbling he will have been crumbling we will have been crumbling you will have been crumbling they will have been crumbling
Conditional
Present
I would crumble you would crumble he would crumble we would crumble you would crumble they would crumble
Present continuous
I would be crumbling you would be crumbling he would be crumbling we would be crumbling you would be crumbling they would be crumbling
Past
I would have crumbled you would have crumbled he would have crumbled we would have crumbled you would have crumbled they would have crumbled
Past continuous
I would have been crumbling you would have been crumbling he would have been crumbling we would have been crumbling you would have been crumbling they would have been crumbling