English verb conjugation
CAN STAIN

Regular verb: stain - stained - stained

Affirmation

Simple form	V-ing form
I can stain you can stain he can stain we can stain you can stain they can stain	I can be staining you can be staining he can be staining we can be staining you can be staining they can be staining
Perfect	V-ing perfect
I can have stained you can have stained he can have stained we can have stained you can have stained they can have stained	I can have been staining you can have been staining he can have been staining we can have been staining you can have been staining they can have been staining

Negation

Simple form	V-ing form
I cannot stain you cannot stain he cannot stain we cannot stain you cannot stain they cannot stain	I cannot be staining you cannot be staining he cannot be staining we cannot be staining you cannot be staining they cannot be staining
Perfect	V-ing perfect
I cannot have stained you cannot have stained he cannot have stained we cannot have stained you cannot have stained they cannot have stained	I cannot have been staining you cannot have been staining he cannot have been staining we cannot have been staining you cannot have been staining they cannot have been staining

Interrogative form

Simple form	V-ing form
can I stain? can you stain? can he stain? can we stain? can you stain? can they stain?	can I be staining? can you be staining? can he be staining? can we be staining? can you be staining? can they be staining?
Perfect	V-ing perfect
can I have stained? can you have stained? can he have stained? can we have stained? can you have stained? can they have stained?	can I have been staining? can you have been staining? can he have been staining? can we have been staining? can you have been staining? can they have been staining?

Interro-negative form

Simple form	V-ing form
can I not stain? can you not stain? can he not stain? can we not stain? can you not stain? can they not stain?	can I not be staining? can you not be staining? can he not be staining? can we not be staining? can you not be staining? can they not be staining?
Perfect	V-ing perfect
can I not have stained? can you not have stained? can he not have stained? can we not have stained? can you not have stained? can they not have stained?	can I not have been staining? can you not have been staining? can he not have been staining? can we not have been staining? can you not have been staining? can they not have been staining?