English verb conjugation
COULD PERSEVERATE

Regular verb: perseverate - perseverated - perseverated

Affirmation

Simple form	V-ing form
I could perseverate you could perseverate he could perseverate we could perseverate you could perseverate they could perseverate	I could be perseverating you could be perseverating he could be perseverating we could be perseverating you could be perseverating they could be perseverating
Perfect	V-ing perfect
I could have perseverated you could have perseverated he could have perseverated we could have perseverated you could have perseverated they could have perseverated	I could have been perseverating you could have been perseverating he could have been perseverating we could have been perseverating you could have been perseverating they could have been perseverating

Negation

Simple form	V-ing form
I couldn't perseverate you couldn't perseverate he couldn't perseverate we couldn't perseverate you couldn't perseverate they couldn't perseverate	I couldn't be perseverating you couldn't be perseverating he couldn't be perseverating we couldn't be perseverating you couldn't be perseverating they couldn't be perseverating
Perfect	V-ing perfect
I couldn't have perseverated you couldn't have perseverated he couldn't have perseverated we couldn't have perseverated you couldn't have perseverated they couldn't have perseverated	I couldn't have been perseverating you couldn't have been perseverating he couldn't have been perseverating we couldn't have been perseverating you couldn't have been perseverating they couldn't have been perseverating

Interrogative form

Simple form	V-ing form
could I perseverate? could you perseverate? could he perseverate? could we perseverate? could you perseverate? could they perseverate?	could I be perseverating? could you be perseverating? could he be perseverating? could we be perseverating? could you be perseverating? could they be perseverating?
Perfect	V-ing perfect
could I have perseverated? could you have perseverated? could he have perseverated? could we have perseverated? could you have perseverated? could they have perseverated?	could I have been perseverating? could you have been perseverating? could he have been perseverating? could we have been perseverating? could you have been perseverating? could they have been perseverating?

Interro-negative form

Simple form	V-ing form
couldn't I perseverate? couldn't you perseverate? couldn't he perseverate? couldn't we perseverate? couldn't you perseverate? couldn't they perseverate?	couldn't I be perseverating? couldn't you be perseverating? couldn't he be perseverating? couldn't we be perseverating? couldn't you be perseverating? couldn't they be perseverating?
Perfect	V-ing perfect
couldn't I have perseverated? couldn't you have perseverated? couldn't he have perseverated? couldn't we have perseverated? couldn't you have perseverated? couldn't they have perseverated?	couldn't I have been perseverating? couldn't you have been perseverating? couldn't he have been perseverating? couldn't we have been perseverating? couldn't you have been perseverating? couldn't they have been perseverating?