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