I could signalise you could signalise he could signalise we could signalise you could signalise they could signalise
V-ing form
I could be signalising you could be signalising he could be signalising we could be signalising you could be signalising they could be signalising
Perfect
I could have signalised you could have signalised he could have signalised we could have signalised you could have signalised they could have signalised
V-ing perfect
I could have been signalising you could have been signalising he could have been signalising we could have been signalising you could have been signalising they could have been signalising
Negation
Simple form
I could not signalise you could not signalise he could not signalise we could not signalise you could not signalise they could not signalise
V-ing form
I could not be signalising you could not be signalising he could not be signalising we could not be signalising you could not be signalising they could not be signalising
Perfect
I could not have signalised you could not have signalised he could not have signalised we could not have signalised you could not have signalised they could not have signalised
V-ing perfect
I could not have been signalising you could not have been signalising he could not have been signalising we could not have been signalising you could not have been signalising they could not have been signalising
Interrogative form
Simple form
could I signalise? could you signalise? could he signalise? could we signalise? could you signalise? could they signalise?
V-ing form
could I be signalising? could you be signalising? could he be signalising? could we be signalising? could you be signalising? could they be signalising?
Perfect
could I have signalised? could you have signalised? could he have signalised? could we have signalised? could you have signalised? could they have signalised?
V-ing perfect
could I have been signalising? could you have been signalising? could he have been signalising? could we have been signalising? could you have been signalising? could they have been signalising?
Interro-negative form
Simple form
could I not signalise? could you not signalise? could he not signalise? could we not signalise? could you not signalise? could they not signalise?
V-ing form
could I not be signalising? could you not be signalising? could he not be signalising? could we not be signalising? could you not be signalising? could they not be signalising?
Perfect
could I not have signalised? could you not have signalised? could he not have signalised? could we not have signalised? could you not have signalised? could they not have signalised?
V-ing perfect
could I not have been signalising? could you not have been signalising? could he not have been signalising? could we not have been signalising? could you not have been signalising? could they not have been signalising?