I could signify you could signify he could signify we could signify you could signify they could signify
Forma con V-ing
I could be signifying you could be signifying he could be signifying we could be signifying you could be signifying they could be signifying
Perfecto
I could have signified you could have signified he could have signified we could have signified you could have signified they could have signified
Perfecto con V-ing
I could have been signifying you could have been signifying he could have been signifying we could have been signifying you could have been signifying they could have been signifying
Negación
Forma simple
I couldn't signify you couldn't signify he couldn't signify we couldn't signify you couldn't signify they couldn't signify
Forma con V-ing
I couldn't be signifying you couldn't be signifying he couldn't be signifying we couldn't be signifying you couldn't be signifying they couldn't be signifying
Perfecto
I couldn't have signified you couldn't have signified he couldn't have signified we couldn't have signified you couldn't have signified they couldn't have signified
Perfecto con V-ing
I couldn't have been signifying you couldn't have been signifying he couldn't have been signifying we couldn't have been signifying you couldn't have been signifying they couldn't have been signifying
Forma interrogativa
Forma simple
could I signify? could you signify? could he signify? could we signify? could you signify? could they signify?
Forma con V-ing
could I be signifying? could you be signifying? could he be signifying? could we be signifying? could you be signifying? could they be signifying?
Perfecto
could I have signified? could you have signified? could he have signified? could we have signified? could you have signified? could they have signified?
Perfecto con V-ing
could I have been signifying? could you have been signifying? could he have been signifying? could we have been signifying? could you have been signifying? could they have been signifying?
Forma interro-negativa
Forma simple
couldn't I signify? couldn't you signify? couldn't he signify? couldn't we signify? couldn't you signify? couldn't they signify?
Forma con V-ing
couldn't I be signifying? couldn't you be signifying? couldn't he be signifying? couldn't we be signifying? couldn't you be signifying? couldn't they be signifying?
Perfecto
couldn't I have signified? couldn't you have signified? couldn't he have signified? couldn't we have signified? couldn't you have signified? couldn't they have signified?
Perfecto con V-ing
couldn't I have been signifying? couldn't you have been signifying? couldn't he have been signifying? couldn't we have been signifying? couldn't you have been signifying? couldn't they have been signifying?