English verb conjugation
COULD PRESIGNAL

Regular verb: presignal - presignaled - presignaled

Affirmation

Simple form	V-ing form
I could presignal you could presignal she could presignal we could presignal you could presignal they could presignal	I could be presignaling you could be presignaling she could be presignaling we could be presignaling you could be presignaling they could be presignaling
Perfect	V-ing perfect
I could have presignaled you could have presignaled she could have presignaled we could have presignaled you could have presignaled they could have presignaled	I could have been presignaling you could have been presignaling she could have been presignaling we could have been presignaling you could have been presignaling they could have been presignaling

Negation

Simple form	V-ing form
I could not presignal you could not presignal she could not presignal we could not presignal you could not presignal they could not presignal	I could not be presignaling you could not be presignaling she could not be presignaling we could not be presignaling you could not be presignaling they could not be presignaling
Perfect	V-ing perfect
I could not have presignaled you could not have presignaled she could not have presignaled we could not have presignaled you could not have presignaled they could not have presignaled	I could not have been presignaling you could not have been presignaling she could not have been presignaling we could not have been presignaling you could not have been presignaling they could not have been presignaling

Interrogative form

Simple form	V-ing form
could I presignal? could you presignal? could she presignal? could we presignal? could you presignal? could they presignal?	could I be presignaling? could you be presignaling? could she be presignaling? could we be presignaling? could you be presignaling? could they be presignaling?
Perfect	V-ing perfect
could I have presignaled? could you have presignaled? could she have presignaled? could we have presignaled? could you have presignaled? could they have presignaled?	could I have been presignaling? could you have been presignaling? could she have been presignaling? could we have been presignaling? could you have been presignaling? could they have been presignaling?

Interro-negative form

Simple form	V-ing form
could I not presignal? could you not presignal? could she not presignal? could we not presignal? could you not presignal? could they not presignal?	could I not be presignaling? could you not be presignaling? could she not be presignaling? could we not be presignaling? could you not be presignaling? could they not be presignaling?
Perfect	V-ing perfect
could I not have presignaled? could you not have presignaled? could she not have presignaled? could we not have presignaled? could you not have presignaled? could they not have presignaled?	could I not have been presignaling? could you not have been presignaling? could she not have been presignaling? could we not have been presignaling? could you not have been presignaling? could they not have been presignaling?