I can tidy you can tidy he can tidy we can tidy you can tidy they can tidy
V-ing form
I can be tidying you can be tidying he can be tidying we can be tidying you can be tidying they can be tidying
Perfect
I can have tidied you can have tidied he can have tidied we can have tidied you can have tidied they can have tidied
V-ing perfect
I can have been tidying you can have been tidying he can have been tidying we can have been tidying you can have been tidying they can have been tidying
Negation
Simple form
I cannot tidy you cannot tidy he cannot tidy we cannot tidy you cannot tidy they cannot tidy
V-ing form
I cannot be tidying you cannot be tidying he cannot be tidying we cannot be tidying you cannot be tidying they cannot be tidying
Perfect
I cannot have tidied you cannot have tidied he cannot have tidied we cannot have tidied you cannot have tidied they cannot have tidied
V-ing perfect
I cannot have been tidying you cannot have been tidying he cannot have been tidying we cannot have been tidying you cannot have been tidying they cannot have been tidying
Interrogative form
Simple form
can I tidy? can you tidy? can he tidy? can we tidy? can you tidy? can they tidy?
V-ing form
can I be tidying? can you be tidying? can he be tidying? can we be tidying? can you be tidying? can they be tidying?
Perfect
can I have tidied? can you have tidied? can he have tidied? can we have tidied? can you have tidied? can they have tidied?
V-ing perfect
can I have been tidying? can you have been tidying? can he have been tidying? can we have been tidying? can you have been tidying? can they have been tidying?
Interro-negative form
Simple form
can I not tidy? can you not tidy? can he not tidy? can we not tidy? can you not tidy? can they not tidy?
V-ing form
can I not be tidying? can you not be tidying? can he not be tidying? can we not be tidying? can you not be tidying? can they not be tidying?
Perfect
can I not have tidied? can you not have tidied? can he not have tidied? can we not have tidied? can you not have tidied? can they not have tidied?
V-ing perfect
can I not have been tidying? can you not have been tidying? can he not have been tidying? can we not have been tidying? can you not have been tidying? can they not have been tidying?