I could commend you could commend he could commend we could commend you could commend they could commend
V-ing form
I could be commending you could be commending he could be commending we could be commending you could be commending they could be commending
Perfect
I could have commended you could have commended he 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 he 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 he 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 he 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 he 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 he 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 he commend? could we commend? could you commend? could they commend?
V-ing form
could I be commending? could you be commending? could he be commending? could we be commending? could you be commending? could they be commending?
Perfect
could I have commended? could you have commended? could he 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 he 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 he 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 he 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 he 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 he have been commending? couldn't we have been commending? couldn't you have been commending? couldn't they have been commending?