I could rejuvenate you could rejuvenate he could rejuvenate we could rejuvenate you could rejuvenate they could rejuvenate
V-ing form
I could be rejuvenating you could be rejuvenating he could be rejuvenating we could be rejuvenating you could be rejuvenating they could be rejuvenating
Perfect
I could have rejuvenated you could have rejuvenated he could have rejuvenated we could have rejuvenated you could have rejuvenated they could have rejuvenated
V-ing perfect
I could have been rejuvenating you could have been rejuvenating he could have been rejuvenating we could have been rejuvenating you could have been rejuvenating they could have been rejuvenating
Negation
Simple form
I couldn't rejuvenate you couldn't rejuvenate he couldn't rejuvenate we couldn't rejuvenate you couldn't rejuvenate they couldn't rejuvenate
V-ing form
I couldn't be rejuvenating you couldn't be rejuvenating he couldn't be rejuvenating we couldn't be rejuvenating you couldn't be rejuvenating they couldn't be rejuvenating
Perfect
I couldn't have rejuvenated you couldn't have rejuvenated he couldn't have rejuvenated we couldn't have rejuvenated you couldn't have rejuvenated they couldn't have rejuvenated
V-ing perfect
I couldn't have been rejuvenating you couldn't have been rejuvenating he couldn't have been rejuvenating we couldn't have been rejuvenating you couldn't have been rejuvenating they couldn't have been rejuvenating
Interrogative form
Simple form
could I rejuvenate? could you rejuvenate? could he rejuvenate? could we rejuvenate? could you rejuvenate? could they rejuvenate?
V-ing form
could I be rejuvenating? could you be rejuvenating? could he be rejuvenating? could we be rejuvenating? could you be rejuvenating? could they be rejuvenating?
Perfect
could I have rejuvenated? could you have rejuvenated? could he have rejuvenated? could we have rejuvenated? could you have rejuvenated? could they have rejuvenated?
V-ing perfect
could I have been rejuvenating? could you have been rejuvenating? could he have been rejuvenating? could we have been rejuvenating? could you have been rejuvenating? could they have been rejuvenating?
Interro-negative form
Simple form
couldn't I rejuvenate? couldn't you rejuvenate? couldn't he rejuvenate? couldn't we rejuvenate? couldn't you rejuvenate? couldn't they rejuvenate?
V-ing form
couldn't I be rejuvenating? couldn't you be rejuvenating? couldn't he be rejuvenating? couldn't we be rejuvenating? couldn't you be rejuvenating? couldn't they be rejuvenating?
Perfect
couldn't I have rejuvenated? couldn't you have rejuvenated? couldn't he have rejuvenated? couldn't we have rejuvenated? couldn't you have rejuvenated? couldn't they have rejuvenated?
V-ing perfect
couldn't I have been rejuvenating? couldn't you have been rejuvenating? couldn't he have been rejuvenating? couldn't we have been rejuvenating? couldn't you have been rejuvenating? couldn't they have been rejuvenating?