English verb conjugation
CAN SIGNIFY

Regular verb: signify - signified - signified

Affirmation

Simple form	V-ing form
I can signify you can signify he can signify we can signify you can signify they can signify	I can be signifying you can be signifying he can be signifying we can be signifying you can be signifying they can be signifying
Perfect	V-ing perfect
I can have signified you can have signified he can have signified we can have signified you can have signified they can have signified	I can have been signifying you can have been signifying he can have been signifying we can have been signifying you can have been signifying they can have been signifying

Negation

Simple form	V-ing form
I can't signify you can't signify he can't signify we can't signify you can't signify they can't signify	I can't be signifying you can't be signifying he can't be signifying we can't be signifying you can't be signifying they can't be signifying
Perfect	V-ing perfect
I can't have signified you can't have signified he can't have signified we can't have signified you can't have signified they can't have signified	I can't have been signifying you can't have been signifying he can't have been signifying we can't have been signifying you can't have been signifying they can't have been signifying

Interrogative form

Simple form	V-ing form
can I signify? can you signify? can he signify? can we signify? can you signify? can they signify?	can I be signifying? can you be signifying? can he be signifying? can we be signifying? can you be signifying? can they be signifying?
Perfect	V-ing perfect
can I have signified? can you have signified? can he have signified? can we have signified? can you have signified? can they have signified?	can I have been signifying? can you have been signifying? can he have been signifying? can we have been signifying? can you have been signifying? can they have been signifying?

Interro-negative form

Simple form	V-ing form
can't I signify? can't you signify? can't he signify? can't we signify? can't you signify? can't they signify?	can't I be signifying? can't you be signifying? can't he be signifying? can't we be signifying? can't you be signifying? can't they be signifying?
Perfect	V-ing perfect
can't I have signified? can't you have signified? can't he have signified? can't we have signified? can't you have signified? can't they have signified?	can't I have been signifying? can't you have been signifying? can't he have been signifying? can't we have been signifying? can't you have been signifying? can't they have been signifying?