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