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