English verb conjugation
CAN WALL

Regular verb: wall - walled - walled

Affirmation

Simple form	V-ing form
I can wall you can wall he can wall we can wall you can wall they can wall	I can be walling you can be walling he can be walling we can be walling you can be walling they can be walling
Perfect	V-ing perfect
I can have walled you can have walled he can have walled we can have walled you can have walled they can have walled	I can have been walling you can have been walling he can have been walling we can have been walling you can have been walling they can have been walling

Negation

Simple form	V-ing form
I cannot wall you cannot wall he cannot wall we cannot wall you cannot wall they cannot wall	I cannot be walling you cannot be walling he cannot be walling we cannot be walling you cannot be walling they cannot be walling
Perfect	V-ing perfect
I cannot have walled you cannot have walled he cannot have walled we cannot have walled you cannot have walled they cannot have walled	I cannot have been walling you cannot have been walling he cannot have been walling we cannot have been walling you cannot have been walling they cannot have been walling

Interrogative form

Simple form	V-ing form
can I wall? can you wall? can he wall? can we wall? can you wall? can they wall?	can I be walling? can you be walling? can he be walling? can we be walling? can you be walling? can they be walling?
Perfect	V-ing perfect
can I have walled? can you have walled? can he have walled? can we have walled? can you have walled? can they have walled?	can I have been walling? can you have been walling? can he have been walling? can we have been walling? can you have been walling? can they have been walling?

Interro-negative form

Simple form	V-ing form
can I not wall? can you not wall? can he not wall? can we not wall? can you not wall? can they not wall?	can I not be walling? can you not be walling? can he not be walling? can we not be walling? can you not be walling? can they not be walling?
Perfect	V-ing perfect
can I not have walled? can you not have walled? can he not have walled? can we not have walled? can you not have walled? can they not have walled?	can I not have been walling? can you not have been walling? can he not have been walling? can we not have been walling? can you not have been walling? can they not have been walling?