English verb conjugation
COULD DEVOCALIZE

Regular verb: devocalize - devocalized - devocalized

Affirmation

Simple form	V-ing form
I could devocalize you could devocalize he could devocalize we could devocalize you could devocalize they could devocalize	I could be devocalizing you could be devocalizing he could be devocalizing we could be devocalizing you could be devocalizing they could be devocalizing
Perfect	V-ing perfect
I could have devocalized you could have devocalized he could have devocalized we could have devocalized you could have devocalized they could have devocalized	I could have been devocalizing you could have been devocalizing he could have been devocalizing we could have been devocalizing you could have been devocalizing they could have been devocalizing

Negation

Simple form	V-ing form
I couldn't devocalize you couldn't devocalize he couldn't devocalize we couldn't devocalize you couldn't devocalize they couldn't devocalize	I couldn't be devocalizing you couldn't be devocalizing he couldn't be devocalizing we couldn't be devocalizing you couldn't be devocalizing they couldn't be devocalizing
Perfect	V-ing perfect
I couldn't have devocalized you couldn't have devocalized he couldn't have devocalized we couldn't have devocalized you couldn't have devocalized they couldn't have devocalized	I couldn't have been devocalizing you couldn't have been devocalizing he couldn't have been devocalizing we couldn't have been devocalizing you couldn't have been devocalizing they couldn't have been devocalizing

Interrogative form

Simple form	V-ing form
could I devocalize? could you devocalize? could he devocalize? could we devocalize? could you devocalize? could they devocalize?	could I be devocalizing? could you be devocalizing? could he be devocalizing? could we be devocalizing? could you be devocalizing? could they be devocalizing?
Perfect	V-ing perfect
could I have devocalized? could you have devocalized? could he have devocalized? could we have devocalized? could you have devocalized? could they have devocalized?	could I have been devocalizing? could you have been devocalizing? could he have been devocalizing? could we have been devocalizing? could you have been devocalizing? could they have been devocalizing?

Interro-negative form

Simple form	V-ing form
couldn't I devocalize? couldn't you devocalize? couldn't he devocalize? couldn't we devocalize? couldn't you devocalize? couldn't they devocalize?	couldn't I be devocalizing? couldn't you be devocalizing? couldn't he be devocalizing? couldn't we be devocalizing? couldn't you be devocalizing? couldn't they be devocalizing?
Perfect	V-ing perfect
couldn't I have devocalized? couldn't you have devocalized? couldn't he have devocalized? couldn't we have devocalized? couldn't you have devocalized? couldn't they have devocalized?	couldn't I have been devocalizing? couldn't you have been devocalizing? couldn't he have been devocalizing? couldn't we have been devocalizing? couldn't you have been devocalizing? couldn't they have been devocalizing?