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