Present
I knuckle
you knuckle
he knuckles
we knuckle
you knuckle
they knuckle

Perfect
I have knuckled
you have knuckled
he has knuckled
we have knuckled
you have knuckled
they have knuckled

Past
I knuckled
you knuckled
he knuckled
we knuckled
you knuckled
they knuckled

Pluperfect
I had knuckled
you had knuckled
he had knuckled
we had knuckled
you had knuckled
they had knuckled

Future
I will knuckle
you will knuckle
he will knuckle
we will knuckle
you will knuckle
they will knuckle

Future perfect
I will have knuckled
you will have knuckled
he will have knuckled
we will have knuckled
you will have knuckled
they will have knuckled

Present
I knuckle
you knuckle
he knuckle
we knuckle
you knuckle
they knuckle

Present
I have knuckled
you have knuckled
he have knuckled
we have knuckled
you have knuckled
they have knuckled

Imperfect
I knuckled
you knuckled
he knuckled
we knuckled
you knuckled
they knuckled

Pluperfect
I had knuckled
you had knuckled
he had knuckled
we had knuckled
you had knuckled
they had knuckled

Present
I would knuckle
you would knuckle
he would knuckle
we would knuckle
you would knuckle
they would knuckle

Perfect
I would have knuckled
you would have knuckled
he would have knuckled
we would have knuckled
you would have knuckled
they would have knuckled

you knuckle
we Let's knuckle
you knuckle

Present
I am knuckling
you are knuckling
he is knuckling
we are knuckling
you are knuckling
they are knuckling

Perfect
I have been knuckling
you have been knuckling
he has been knuckling
we have been knuckling
you have been knuckling
they have been knuckling

Past
I was knuckling
you were knuckling
he was knuckling
we were knuckling
you were knuckling
they were knuckling

Pluperfect
I had been knuckling
you had been knuckling
he had been knuckling
we had been knuckling
you had been knuckling
they had been knuckling

Future
I will be knuckling
you will be knuckling
he will be knuckling
we will be knuckling
you will be knuckling
they will be knuckling

Future perfect
I will have been knuckling
you will have been knuckling
he will have been knuckling
we will have been knuckling
you will have been knuckling
they will have been knuckling

Present
I would be knuckling
you would be knuckling
he would be knuckling
we would be knuckling
you would be knuckling
they would be knuckling

Perfect
I would have been knuckling
you would have been knuckling
he would have been knuckling
we would have been knuckling
you would have been knuckling
they would have been knuckling