I could rejuvenate you could rejuvenate she could rejuvenate we could rejuvenate you could rejuvenate they could rejuvenate
V-ing form
I could be rejuvenating you could be rejuvenating she could be rejuvenating we could be rejuvenating you could be rejuvenating they could be rejuvenating
Perfect
I could have rejuvenated you could have rejuvenated she 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 she 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 she 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 she 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 she 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 she 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 she rejuvenate? could we rejuvenate? could you rejuvenate? could they rejuvenate?
V-ing form
could I be rejuvenating? could you be rejuvenating? could she be rejuvenating? could we be rejuvenating? could you be rejuvenating? could they be rejuvenating?
Perfect
could I have rejuvenated? could you have rejuvenated? could she 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 she 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 she 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 she 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 she 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 she have been rejuvenating? couldn't we have been rejuvenating? couldn't you have been rejuvenating? couldn't they have been rejuvenating?