knuckle under

• I knuckle
• you knuckle
• you knuckle
• he/she/it knuckles
• we knuckle
• they knuckle

• I knuckled
• you knuckled
• you knuckled
• he/she/it knuckled
• we knuckled
• they knuckled

• I am knuckling
• you are knuckling
• you are knuckling
• he/she/it is knuckling
• we are knuckling
• they are knuckling

• I have knuckled
• you have knuckled
• you have knuckled
• he/she/it has knuckled
• we have knuckled
• they have knuckled

• I will knuckle
• you will knuckle
• you will knuckle
• he/she/it will knuckle
• we will knuckle
• they will knuckle

• I will have knuckled
• you will have knuckled
• you will have knuckled
• he/she/it will have knuckled
• we will have knuckled
• they will have knuckled

• I was knuckling
• you were knuckling
• you were knuckling
• he/she/it was knuckling
• we were knuckling
• they were knuckling

• I had knuckled
• you had knuckled
• you had knuckled
• he/she/it had knuckled
• we had knuckled
• they had knuckled

• I will be knuckling
• you will be knuckling
• you will be knuckling
• he/she/it will be knuckling
• we will be knuckling
• they will be knuckling

• I have been knuckling
• you have been knuckling
• you have been knuckling
• he/she/it has been knuckling
• we have been knuckling
• they have been knuckling

• I had been knuckling
• you had been knuckling
• you had been knuckling
• he/she/it had been knuckling
• we had been knuckling
• they had been knuckling

• I will have been knuckling
• you will have been knuckling
• you will have been knuckling
• he/she/it will have been knuckling
• we will have been knuckling
• they will have been knuckling

• knuckling

• knuckled

• having knuckled