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 cannot checkmate you cannot checkmate he cannot checkmate we cannot checkmate you cannot checkmate they cannot checkmate	I cannot be checkmating you cannot be checkmating he cannot be checkmating we cannot be checkmating you cannot be checkmating they cannot be checkmating
Perfect	V-ing perfect
I cannot have checkmated you cannot have checkmated he cannot have checkmated we cannot have checkmated you cannot have checkmated they cannot have checkmated	I cannot have been checkmating you cannot have been checkmating he cannot have been checkmating we cannot have been checkmating you cannot have been checkmating they cannot 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 I not checkmate? can you not checkmate? can he not checkmate? can we not checkmate? can you not checkmate? can they not checkmate?	can I not be checkmating? can you not be checkmating? can he not be checkmating? can we not be checkmating? can you not be checkmating? can they not be checkmating?
Perfect	V-ing perfect
can I not have checkmated? can you not have checkmated? can he not have checkmated? can we not have checkmated? can you not have checkmated? can they not have checkmated?	can I not have been checkmating? can you not have been checkmating? can he not have been checkmating? can we not have been checkmating? can you not have been checkmating? can they not have been checkmating?