I could plink you could plink she could plink we could plink you could plink they could plink
V-ing form
I could be plinking you could be plinking she could be plinking we could be plinking you could be plinking they could be plinking
Perfect
I could have plinked you could have plinked she could have plinked we could have plinked you could have plinked they could have plinked
V-ing perfect
I could have been plinking you could have been plinking she could have been plinking we could have been plinking you could have been plinking they could have been plinking
Negation
Simple form
I couldn't plink you couldn't plink she couldn't plink we couldn't plink you couldn't plink they couldn't plink
V-ing form
I couldn't be plinking you couldn't be plinking she couldn't be plinking we couldn't be plinking you couldn't be plinking they couldn't be plinking
Perfect
I couldn't have plinked you couldn't have plinked she couldn't have plinked we couldn't have plinked you couldn't have plinked they couldn't have plinked
V-ing perfect
I couldn't have been plinking you couldn't have been plinking she couldn't have been plinking we couldn't have been plinking you couldn't have been plinking they couldn't have been plinking
Interrogative form
Simple form
could I plink? could you plink? could she plink? could we plink? could you plink? could they plink?
V-ing form
could I be plinking? could you be plinking? could she be plinking? could we be plinking? could you be plinking? could they be plinking?
Perfect
could I have plinked? could you have plinked? could she have plinked? could we have plinked? could you have plinked? could they have plinked?
V-ing perfect
could I have been plinking? could you have been plinking? could she have been plinking? could we have been plinking? could you have been plinking? could they have been plinking?
Interro-negative form
Simple form
couldn't I plink? couldn't you plink? couldn't she plink? couldn't we plink? couldn't you plink? couldn't they plink?
V-ing form
couldn't I be plinking? couldn't you be plinking? couldn't she be plinking? couldn't we be plinking? couldn't you be plinking? couldn't they be plinking?
Perfect
couldn't I have plinked? couldn't you have plinked? couldn't she have plinked? couldn't we have plinked? couldn't you have plinked? couldn't they have plinked?
V-ing perfect
couldn't I have been plinking? couldn't you have been plinking? couldn't she have been plinking? couldn't we have been plinking? couldn't you have been plinking? couldn't they have been plinking?