I knock you knock he knocks we knock you knock they knock
Present continuous
I am knocking you are knocking he is knocking we are knocking you are knocking they are knocking
Preterite
I knocked you knocked he knocked we knocked you knocked they knocked
Preterite continuous
I was knocking you were knocking he was knocking we were knocking you were knocking they were knocking
Present perfect
I have knocked you have knocked he has knocked we have knocked you have knocked they have knocked
Present perfect continuous
I have been knocking you have been knocking he has been knocking we have been knocking you have been knocking they have been knocking
Pluperfect
I had knocked you had knocked he had knocked we had knocked you had knocked they had knocked
Pluperfect continuous
I had been knocking you had been knocking he had been knocking we had been knocking you had been knocking they had been knocking
Future
I will knock you will knock he will knock we will knock you will knock they will knock
Future continuous
I will be knocking you will be knocking he will be knocking we will be knocking you will be knocking they will be knocking
Future perfect
I will have knocked you will have knocked he will have knocked we will have knocked you will have knocked they will have knocked
Future perfect continuous
I will have been knocking you will have been knocking he will have been knocking we will have been knocking you will have been knocking they will have been knocking
Conditional
Present
I would knock you would knock he would knock we would knock you would knock they would knock
Present continuous
I would be knocking you would be knocking he would be knocking we would be knocking you would be knocking they would be knocking
Past
I would have knocked you would have knocked he would have knocked we would have knocked you would have knocked they would have knocked
Past continuous
I would have been knocking you would have been knocking he would have been knocking we would have been knocking you would have been knocking they would have been knocking