English verb conjugation
CAN CHECKMATE

Regular verb: checkmate - checkmated - checkmated

Affirmation

Simple form	V-ing form
I can checkmate you can checkmate he can checkmate we can checkmate you can checkmate they can checkmate	I can be checkmating you can be checkmating he can be checkmating we can be checkmating you can be checkmating they can be checkmating
Perfect	V-ing perfect
I can have checkmated you can have checkmated he can have checkmated we can have checkmated you can have checkmated they can have checkmated	I can have been checkmating you can have been checkmating he can have been checkmating we can have been checkmating you can have been checkmating they can have been checkmating

Negation

Simple form	V-ing form
I can't checkmate you can't checkmate he can't checkmate we can't checkmate you can't checkmate they can't checkmate	I can't be checkmating you can't be checkmating he can't be checkmating we can't be checkmating you can't be checkmating they can't be checkmating
Perfect	V-ing perfect
I can't have checkmated you can't have checkmated he can't have checkmated we can't have checkmated you can't have checkmated they can't have checkmated	I can't have been checkmating you can't have been checkmating he can't have been checkmating we can't have been checkmating you can't have been checkmating they can't have been checkmating

Interrogative form

Simple form	V-ing form
can I checkmate? can you checkmate? can he checkmate? can we checkmate? can you checkmate? can they checkmate?	can I be checkmating? can you be checkmating? can he be checkmating? can we be checkmating? can you be checkmating? can they be checkmating?
Perfect	V-ing perfect
can I have checkmated? can you have checkmated? can he have checkmated? can we have checkmated? can you have checkmated? can they have checkmated?	can I have been checkmating? can you have been checkmating? can he have been checkmating? can we have been checkmating? can you have been checkmating? can they have been checkmating?

Interro-negative form

Simple form	V-ing form
can't I checkmate? can't you checkmate? can't he checkmate? can't we checkmate? can't you checkmate? can't they checkmate?	can't I be checkmating? can't you be checkmating? can't he be checkmating? can't we be checkmating? can't you be checkmating? can't they be checkmating?
Perfect	V-ing perfect
can't I have checkmated? can't you have checkmated? can't he have checkmated? can't we have checkmated? can't you have checkmated? can't they have checkmated?	can't I have been checkmating? can't you have been checkmating? can't he have been checkmating? can't we have been checkmating? can't you have been checkmating? can't they have been checkmating?