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