I could signalize you could signalize she could signalize we could signalize you could signalize they could signalize
V-ing form
I could be signalizing you could be signalizing she could be signalizing we could be signalizing you could be signalizing they could be signalizing
Perfect
I could have signalized you could have signalized she could have signalized we could have signalized you could have signalized they could have signalized
V-ing perfect
I could have been signalizing you could have been signalizing she could have been signalizing we could have been signalizing you could have been signalizing they could have been signalizing
Negation
Simple form
I couldn't signalize you couldn't signalize she couldn't signalize we couldn't signalize you couldn't signalize they couldn't signalize
V-ing form
I couldn't be signalizing you couldn't be signalizing she couldn't be signalizing we couldn't be signalizing you couldn't be signalizing they couldn't be signalizing
Perfect
I couldn't have signalized you couldn't have signalized she couldn't have signalized we couldn't have signalized you couldn't have signalized they couldn't have signalized
V-ing perfect
I couldn't have been signalizing you couldn't have been signalizing she couldn't have been signalizing we couldn't have been signalizing you couldn't have been signalizing they couldn't have been signalizing
Interrogative form
Simple form
could I signalize? could you signalize? could she signalize? could we signalize? could you signalize? could they signalize?
V-ing form
could I be signalizing? could you be signalizing? could she be signalizing? could we be signalizing? could you be signalizing? could they be signalizing?
Perfect
could I have signalized? could you have signalized? could she have signalized? could we have signalized? could you have signalized? could they have signalized?
V-ing perfect
could I have been signalizing? could you have been signalizing? could she have been signalizing? could we have been signalizing? could you have been signalizing? could they have been signalizing?
Interro-negative form
Simple form
couldn't I signalize? couldn't you signalize? couldn't she signalize? couldn't we signalize? couldn't you signalize? couldn't they signalize?
V-ing form
couldn't I be signalizing? couldn't you be signalizing? couldn't she be signalizing? couldn't we be signalizing? couldn't you be signalizing? couldn't they be signalizing?
Perfect
couldn't I have signalized? couldn't you have signalized? couldn't she have signalized? couldn't we have signalized? couldn't you have signalized? couldn't they have signalized?
V-ing perfect
couldn't I have been signalizing? couldn't you have been signalizing? couldn't she have been signalizing? couldn't we have been signalizing? couldn't you have been signalizing? couldn't they have been signalizing?