I can quench you can quench he can quench we can quench you can quench they can quench
V-ing form
I can be quenching you can be quenching he can be quenching we can be quenching you can be quenching they can be quenching
Perfect
I can have quenched you can have quenched he can have quenched we can have quenched you can have quenched they can have quenched
V-ing perfect
I can have been quenching you can have been quenching he can have been quenching we can have been quenching you can have been quenching they can have been quenching
Negation
Simple form
I cannot quench you cannot quench he cannot quench we cannot quench you cannot quench they cannot quench
V-ing form
I cannot be quenching you cannot be quenching he cannot be quenching we cannot be quenching you cannot be quenching they cannot be quenching
Perfect
I cannot have quenched you cannot have quenched he cannot have quenched we cannot have quenched you cannot have quenched they cannot have quenched
V-ing perfect
I cannot have been quenching you cannot have been quenching he cannot have been quenching we cannot have been quenching you cannot have been quenching they cannot have been quenching
Interrogative form
Simple form
can I quench? can you quench? can he quench? can we quench? can you quench? can they quench?
V-ing form
can I be quenching? can you be quenching? can he be quenching? can we be quenching? can you be quenching? can they be quenching?
Perfect
can I have quenched? can you have quenched? can he have quenched? can we have quenched? can you have quenched? can they have quenched?
V-ing perfect
can I have been quenching? can you have been quenching? can he have been quenching? can we have been quenching? can you have been quenching? can they have been quenching?
Interro-negative form
Simple form
can I not quench? can you not quench? can he not quench? can we not quench? can you not quench? can they not quench?
V-ing form
can I not be quenching? can you not be quenching? can he not be quenching? can we not be quenching? can you not be quenching? can they not be quenching?
Perfect
can I not have quenched? can you not have quenched? can he not have quenched? can we not have quenched? can you not have quenched? can they not have quenched?
V-ing perfect
can I not have been quenching? can you not have been quenching? can he not have been quenching? can we not have been quenching? can you not have been quenching? can they not have been quenching?