Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could pick up you could pick up he could pick up we could pick up you could pick up they could pick up
V-ing form
I could be pick uping you could be pick uping he could be pick uping we could be pick uping you could be pick uping they could be pick uping
Perfect
I could have pick uped you could have pick uped he could have pick uped we could have pick uped you could have pick uped they could have pick uped
V-ing perfect
I could have been pick uping you could have been pick uping he could have been pick uping we could have been pick uping you could have been pick uping they could have been pick uping
Negation
Simple form
I couldn't pick up you couldn't pick up he couldn't pick up we couldn't pick up you couldn't pick up they couldn't pick up
V-ing form
I couldn't be pick uping you couldn't be pick uping he couldn't be pick uping we couldn't be pick uping you couldn't be pick uping they couldn't be pick uping
Perfect
I couldn't have pick uped you couldn't have pick uped he couldn't have pick uped we couldn't have pick uped you couldn't have pick uped they couldn't have pick uped
V-ing perfect
I couldn't have been pick uping you couldn't have been pick uping he couldn't have been pick uping we couldn't have been pick uping you couldn't have been pick uping they couldn't have been pick uping
Interrogative form
Simple form
could I pick up? could you pick up? could he pick up? could we pick up? could you pick up? could they pick up?
V-ing form
could I be pick uping? could you be pick uping? could he be pick uping? could we be pick uping? could you be pick uping? could they be pick uping?
Perfect
could I have pick uped? could you have pick uped? could he have pick uped? could we have pick uped? could you have pick uped? could they have pick uped?
V-ing perfect
could I have been pick uping? could you have been pick uping? could he have been pick uping? could we have been pick uping? could you have been pick uping? could they have been pick uping?
Interro-negative form
Simple form
couldn't I pick up? couldn't you pick up? couldn't he pick up? couldn't we pick up? couldn't you pick up? couldn't they pick up?
V-ing form
couldn't I be pick uping? couldn't you be pick uping? couldn't he be pick uping? couldn't we be pick uping? couldn't you be pick uping? couldn't they be pick uping?
Perfect
couldn't I have pick uped? couldn't you have pick uped? couldn't he have pick uped? couldn't we have pick uped? couldn't you have pick uped? couldn't they have pick uped?
V-ing perfect
couldn't I have been pick uping? couldn't you have been pick uping? couldn't he have been pick uping? couldn't we have been pick uping? couldn't you have been pick uping? couldn't they have been pick uping?