English verb conjugation
CAN RETREAT

Regular verb: retreat - retreated - retreated

Affirmation

Simple form	V-ing form
I can retreat you can retreat he can retreat we can retreat you can retreat they can retreat	I can be retreating you can be retreating he can be retreating we can be retreating you can be retreating they can be retreating
Perfect	V-ing perfect
I can have retreated you can have retreated he can have retreated we can have retreated you can have retreated they can have retreated	I can have been retreating you can have been retreating he can have been retreating we can have been retreating you can have been retreating they can have been retreating

Negation

Simple form	V-ing form
I cannot retreat you cannot retreat he cannot retreat we cannot retreat you cannot retreat they cannot retreat	I cannot be retreating you cannot be retreating he cannot be retreating we cannot be retreating you cannot be retreating they cannot be retreating
Perfect	V-ing perfect
I cannot have retreated you cannot have retreated he cannot have retreated we cannot have retreated you cannot have retreated they cannot have retreated	I cannot have been retreating you cannot have been retreating he cannot have been retreating we cannot have been retreating you cannot have been retreating they cannot have been retreating

Interrogative form

Simple form	V-ing form
can I retreat? can you retreat? can he retreat? can we retreat? can you retreat? can they retreat?	can I be retreating? can you be retreating? can he be retreating? can we be retreating? can you be retreating? can they be retreating?
Perfect	V-ing perfect
can I have retreated? can you have retreated? can he have retreated? can we have retreated? can you have retreated? can they have retreated?	can I have been retreating? can you have been retreating? can he have been retreating? can we have been retreating? can you have been retreating? can they have been retreating?

Interro-negative form

Simple form	V-ing form
can I not retreat? can you not retreat? can he not retreat? can we not retreat? can you not retreat? can they not retreat?	can I not be retreating? can you not be retreating? can he not be retreating? can we not be retreating? can you not be retreating? can they not be retreating?
Perfect	V-ing perfect
can I not have retreated? can you not have retreated? can he not have retreated? can we not have retreated? can you not have retreated? can they not have retreated?	can I not have been retreating? can you not have been retreating? can he not have been retreating? can we not have been retreating? can you not have been retreating? can they not have been retreating?