I can stagnate you can stagnate he can stagnate we can stagnate you can stagnate they can stagnate
V-ing form
I can be stagnating you can be stagnating he can be stagnating we can be stagnating you can be stagnating they can be stagnating
Perfect
I can have stagnated you can have stagnated he can have stagnated we can have stagnated you can have stagnated they can have stagnated
V-ing perfect
I can have been stagnating you can have been stagnating he can have been stagnating we can have been stagnating you can have been stagnating they can have been stagnating
Negation
Simple form
I cannot stagnate you cannot stagnate he cannot stagnate we cannot stagnate you cannot stagnate they cannot stagnate
V-ing form
I cannot be stagnating you cannot be stagnating he cannot be stagnating we cannot be stagnating you cannot be stagnating they cannot be stagnating
Perfect
I cannot have stagnated you cannot have stagnated he cannot have stagnated we cannot have stagnated you cannot have stagnated they cannot have stagnated
V-ing perfect
I cannot have been stagnating you cannot have been stagnating he cannot have been stagnating we cannot have been stagnating you cannot have been stagnating they cannot have been stagnating
Interrogative form
Simple form
can I stagnate? can you stagnate? can he stagnate? can we stagnate? can you stagnate? can they stagnate?
V-ing form
can I be stagnating? can you be stagnating? can he be stagnating? can we be stagnating? can you be stagnating? can they be stagnating?
Perfect
can I have stagnated? can you have stagnated? can he have stagnated? can we have stagnated? can you have stagnated? can they have stagnated?
V-ing perfect
can I have been stagnating? can you have been stagnating? can he have been stagnating? can we have been stagnating? can you have been stagnating? can they have been stagnating?
Interro-negative form
Simple form
can I not stagnate? can you not stagnate? can he not stagnate? can we not stagnate? can you not stagnate? can they not stagnate?
V-ing form
can I not be stagnating? can you not be stagnating? can he not be stagnating? can we not be stagnating? can you not be stagnating? can they not be stagnating?
Perfect
can I not have stagnated? can you not have stagnated? can he not have stagnated? can we not have stagnated? can you not have stagnated? can they not have stagnated?
V-ing perfect
can I not have been stagnating? can you not have been stagnating? can he not have been stagnating? can we not have been stagnating? can you not have been stagnating? can they not have been stagnating?