English verb conjugation
CAN CHAIR

Regular verb: chair - chaired - chaired

Affirmation

Simple form	V-ing form
I can chair you can chair he can chair we can chair you can chair they can chair	I can be chairing you can be chairing he can be chairing we can be chairing you can be chairing they can be chairing
Perfect	V-ing perfect
I can have chaired you can have chaired he can have chaired we can have chaired you can have chaired they can have chaired	I can have been chairing you can have been chairing he can have been chairing we can have been chairing you can have been chairing they can have been chairing

Negation

Simple form	V-ing form
I cannot chair you cannot chair he cannot chair we cannot chair you cannot chair they cannot chair	I cannot be chairing you cannot be chairing he cannot be chairing we cannot be chairing you cannot be chairing they cannot be chairing
Perfect	V-ing perfect
I cannot have chaired you cannot have chaired he cannot have chaired we cannot have chaired you cannot have chaired they cannot have chaired	I cannot have been chairing you cannot have been chairing he cannot have been chairing we cannot have been chairing you cannot have been chairing they cannot have been chairing

Interrogative form

Simple form	V-ing form
can I chair? can you chair? can he chair? can we chair? can you chair? can they chair?	can I be chairing? can you be chairing? can he be chairing? can we be chairing? can you be chairing? can they be chairing?
Perfect	V-ing perfect
can I have chaired? can you have chaired? can he have chaired? can we have chaired? can you have chaired? can they have chaired?	can I have been chairing? can you have been chairing? can he have been chairing? can we have been chairing? can you have been chairing? can they have been chairing?

Interro-negative form

Simple form	V-ing form
can I not chair? can you not chair? can he not chair? can we not chair? can you not chair? can they not chair?	can I not be chairing? can you not be chairing? can he not be chairing? can we not be chairing? can you not be chairing? can they not be chairing?
Perfect	V-ing perfect
can I not have chaired? can you not have chaired? can he not have chaired? can we not have chaired? can you not have chaired? can they not have chaired?	can I not have been chairing? can you not have been chairing? can he not have been chairing? can we not have been chairing? can you not have been chairing? can they not have been chairing?