| Simple | Progressive | Perfect | Progressive |
Present |
I crumble |
you crumble |
he/she/it crumbles |
we crumble |
you all crumble |
they crumble |
|
I am crumbling |
you are crumbling |
he/she/it is crumbling |
we are crumbling |
you all are crumbling |
they are crumbling |
|
I have crumbled |
you have crumbled |
he/she/it has crumbled |
we have crumbled |
you all have crumbled |
they have crumbled |
|
I have been crumbling |
you have been crumbling |
he/she/it has been crumbling |
we have been crumbling |
you all have been crumbling |
they have been crumbling |
|
Past |
I crumbled |
you crumbled |
he/she/it crumbled |
we crumbled |
you all crumbled |
they crumbled |
|
I was crumbling |
you were crumbling |
he/she/it was crumbling |
we were crumbling |
you all were crumbling |
they were crumbling |
|
I had crumbled |
you had crumbled |
he/she/it had crumbled |
we had crumbled |
you all had crumbled |
they had crumbled |
|
I had been crumbling |
you had been crumbling |
he/she/it had been crumbling |
we had been crumbling |
you all had been crumbling |
they had been crumbling |
|
Future |
I will crumble |
you will crumble |
he/she/it will crumble |
we will crumble |
you all will crumble |
they will crumble |
|
I will be crumbling |
you will be crumbling |
he/she/it will be crumbling |
we are crumbling |
you all will be crumbling |
they will be crumbling |
|
I will have crumbled |
you will have crumbled |
he/she/it will have crumbled |
we will have crumbled |
you all will have crumbled |
they will have crumbled |
|
I will have been crumbling |
you will have been crumbling |
he/she/it will have been crumbling |
we will have been crumbling |
you all will have been crumbling |
they will have been crumbling |
|