English verb conjugation
COULD INVIGORATE

Regular verb: invigorate - invigorated - invigorated

Affirmation

Simple form	V-ing form
I could invigorate you could invigorate he could invigorate we could invigorate you could invigorate they could invigorate	I could be invigorating you could be invigorating he could be invigorating we could be invigorating you could be invigorating they could be invigorating
Perfect	V-ing perfect
I could have invigorated you could have invigorated he could have invigorated we could have invigorated you could have invigorated they could have invigorated	I could have been invigorating you could have been invigorating he could have been invigorating we could have been invigorating you could have been invigorating they could have been invigorating

Negation

Simple form	V-ing form
I couldn't invigorate you couldn't invigorate he couldn't invigorate we couldn't invigorate you couldn't invigorate they couldn't invigorate	I couldn't be invigorating you couldn't be invigorating he couldn't be invigorating we couldn't be invigorating you couldn't be invigorating they couldn't be invigorating
Perfect	V-ing perfect
I couldn't have invigorated you couldn't have invigorated he couldn't have invigorated we couldn't have invigorated you couldn't have invigorated they couldn't have invigorated	I couldn't have been invigorating you couldn't have been invigorating he couldn't have been invigorating we couldn't have been invigorating you couldn't have been invigorating they couldn't have been invigorating

Interrogative form

Simple form	V-ing form
could I invigorate? could you invigorate? could he invigorate? could we invigorate? could you invigorate? could they invigorate?	could I be invigorating? could you be invigorating? could he be invigorating? could we be invigorating? could you be invigorating? could they be invigorating?
Perfect	V-ing perfect
could I have invigorated? could you have invigorated? could he have invigorated? could we have invigorated? could you have invigorated? could they have invigorated?	could I have been invigorating? could you have been invigorating? could he have been invigorating? could we have been invigorating? could you have been invigorating? could they have been invigorating?

Interro-negative form

Simple form	V-ing form
couldn't I invigorate? couldn't you invigorate? couldn't he invigorate? couldn't we invigorate? couldn't you invigorate? couldn't they invigorate?	couldn't I be invigorating? couldn't you be invigorating? couldn't he be invigorating? couldn't we be invigorating? couldn't you be invigorating? couldn't they be invigorating?
Perfect	V-ing perfect
couldn't I have invigorated? couldn't you have invigorated? couldn't he have invigorated? couldn't we have invigorated? couldn't you have invigorated? couldn't they have invigorated?	couldn't I have been invigorating? couldn't you have been invigorating? couldn't he have been invigorating? couldn't we have been invigorating? couldn't you have been invigorating? couldn't they have been invigorating?