English verb conjugation
COULD PRESIGNAL

Regular verb: presignal - presignaled - presignaled

Affirmation

Simple form	V-ing form
I could presignal you could presignal he could presignal we could presignal you could presignal they could presignal	I could be presignaling you could be presignaling he 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 he 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 he 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 couldn't presignal you couldn't presignal he couldn't presignal we couldn't presignal you couldn't presignal they couldn't presignal	I couldn't be presignaling you couldn't be presignaling he couldn't be presignaling we couldn't be presignaling you couldn't be presignaling they couldn't be presignaling
Perfect	V-ing perfect
I couldn't have presignaled you couldn't have presignaled he couldn't have presignaled we couldn't have presignaled you couldn't have presignaled they couldn't have presignaled	I couldn't have been presignaling you couldn't have been presignaling he couldn't have been presignaling we couldn't have been presignaling you couldn't have been presignaling they couldn't have been presignaling

Interrogative form

Simple form	V-ing form
could I presignal? could you presignal? could he presignal? could we presignal? could you presignal? could they presignal?	could I be presignaling? could you be presignaling? could he 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 he 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 he 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
couldn't I presignal? couldn't you presignal? couldn't he presignal? couldn't we presignal? couldn't you presignal? couldn't they presignal?	couldn't I be presignaling? couldn't you be presignaling? couldn't he be presignaling? couldn't we be presignaling? couldn't you be presignaling? couldn't they be presignaling?
Perfect	V-ing perfect
couldn't I have presignaled? couldn't you have presignaled? couldn't he have presignaled? couldn't we have presignaled? couldn't you have presignaled? couldn't they have presignaled?	couldn't I have been presignaling? couldn't you have been presignaling? couldn't he have been presignaling? couldn't we have been presignaling? couldn't you have been presignaling? couldn't they have been presignaling?