I could commend you could commend she could commend we could commend you could commend they could commend
V-ing form
I could be commending you could be commending she could be commending we could be commending you could be commending they could be commending
Perfect
I could have commended you could have commended she could have commended we could have commended you could have commended they could have commended
V-ing perfect
I could have been commending you could have been commending she could have been commending we could have been commending you could have been commending they could have been commending
Negation
Simple form
I couldn't commend you couldn't commend she couldn't commend we couldn't commend you couldn't commend they couldn't commend
V-ing form
I couldn't be commending you couldn't be commending she couldn't be commending we couldn't be commending you couldn't be commending they couldn't be commending
Perfect
I couldn't have commended you couldn't have commended she couldn't have commended we couldn't have commended you couldn't have commended they couldn't have commended
V-ing perfect
I couldn't have been commending you couldn't have been commending she couldn't have been commending we couldn't have been commending you couldn't have been commending they couldn't have been commending
Interrogative form
Simple form
could I commend? could you commend? could she commend? could we commend? could you commend? could they commend?
V-ing form
could I be commending? could you be commending? could she be commending? could we be commending? could you be commending? could they be commending?
Perfect
could I have commended? could you have commended? could she have commended? could we have commended? could you have commended? could they have commended?
V-ing perfect
could I have been commending? could you have been commending? could she have been commending? could we have been commending? could you have been commending? could they have been commending?
Interro-negative form
Simple form
couldn't I commend? couldn't you commend? couldn't she commend? couldn't we commend? couldn't you commend? couldn't they commend?
V-ing form
couldn't I be commending? couldn't you be commending? couldn't she be commending? couldn't we be commending? couldn't you be commending? couldn't they be commending?
Perfect
couldn't I have commended? couldn't you have commended? couldn't she have commended? couldn't we have commended? couldn't you have commended? couldn't they have commended?
V-ing perfect
couldn't I have been commending? couldn't you have been commending? couldn't she have been commending? couldn't we have been commending? couldn't you have been commending? couldn't they have been commending?