I can quell you can quell he can quell we can quell you can quell they can quell
V-ing form
I can be quelling you can be quelling he can be quelling we can be quelling you can be quelling they can be quelling
Perfect
I can have quelled you can have quelled he can have quelled we can have quelled you can have quelled they can have quelled
V-ing perfect
I can have been quelling you can have been quelling he can have been quelling we can have been quelling you can have been quelling they can have been quelling
Negation
Simple form
I cannot quell you cannot quell he cannot quell we cannot quell you cannot quell they cannot quell
V-ing form
I cannot be quelling you cannot be quelling he cannot be quelling we cannot be quelling you cannot be quelling they cannot be quelling
Perfect
I cannot have quelled you cannot have quelled he cannot have quelled we cannot have quelled you cannot have quelled they cannot have quelled
V-ing perfect
I cannot have been quelling you cannot have been quelling he cannot have been quelling we cannot have been quelling you cannot have been quelling they cannot have been quelling
Interrogative form
Simple form
can I quell? can you quell? can he quell? can we quell? can you quell? can they quell?
V-ing form
can I be quelling? can you be quelling? can he be quelling? can we be quelling? can you be quelling? can they be quelling?
Perfect
can I have quelled? can you have quelled? can he have quelled? can we have quelled? can you have quelled? can they have quelled?
V-ing perfect
can I have been quelling? can you have been quelling? can he have been quelling? can we have been quelling? can you have been quelling? can they have been quelling?
Interro-negative form
Simple form
can I not quell? can you not quell? can he not quell? can we not quell? can you not quell? can they not quell?
V-ing form
can I not be quelling? can you not be quelling? can he not be quelling? can we not be quelling? can you not be quelling? can they not be quelling?
Perfect
can I not have quelled? can you not have quelled? can he not have quelled? can we not have quelled? can you not have quelled? can they not have quelled?
V-ing perfect
can I not have been quelling? can you not have been quelling? can he not have been quelling? can we not have been quelling? can you not have been quelling? can they not have been quelling?