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 can't chair you can't chair he can't chair we can't chair you can't chair they can't chair	I can't be chairing you can't be chairing he can't be chairing we can't be chairing you can't be chairing they can't be chairing
Perfect	V-ing perfect
I can't have chaired you can't have chaired he can't have chaired we can't have chaired you can't have chaired they can't have chaired	I can't have been chairing you can't have been chairing he can't have been chairing we can't have been chairing you can't have been chairing they can't 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't I chair? can't you chair? can't he chair? can't we chair? can't you chair? can't they chair?	can't I be chairing? can't you be chairing? can't he be chairing? can't we be chairing? can't you be chairing? can't they be chairing?
Perfect	V-ing perfect
can't I have chaired? can't you have chaired? can't he have chaired? can't we have chaired? can't you have chaired? can't they have chaired?	can't I have been chairing? can't you have been chairing? can't he have been chairing? can't we have been chairing? can't you have been chairing? can't they have been chairing?