English verb conjugation
COULD PINE

Regular verb: pine - pined - pined

Affirmation

Simple form	V-ing form
I could pine you could pine he could pine we could pine you could pine they could pine	I could be pining you could be pining he could be pining we could be pining you could be pining they could be pining
Perfect	V-ing perfect
I could have pined you could have pined he could have pined we could have pined you could have pined they could have pined	I could have been pining you could have been pining he could have been pining we could have been pining you could have been pining they could have been pining

Negation

Simple form	V-ing form
I couldn't pine you couldn't pine he couldn't pine we couldn't pine you couldn't pine they couldn't pine	I couldn't be pining you couldn't be pining he couldn't be pining we couldn't be pining you couldn't be pining they couldn't be pining
Perfect	V-ing perfect
I couldn't have pined you couldn't have pined he couldn't have pined we couldn't have pined you couldn't have pined they couldn't have pined	I couldn't have been pining you couldn't have been pining he couldn't have been pining we couldn't have been pining you couldn't have been pining they couldn't have been pining

Interrogative form

Simple form	V-ing form
could I pine? could you pine? could he pine? could we pine? could you pine? could they pine?	could I be pining? could you be pining? could he be pining? could we be pining? could you be pining? could they be pining?
Perfect	V-ing perfect
could I have pined? could you have pined? could he have pined? could we have pined? could you have pined? could they have pined?	could I have been pining? could you have been pining? could he have been pining? could we have been pining? could you have been pining? could they have been pining?

Interro-negative form

Simple form	V-ing form
couldn't I pine? couldn't you pine? couldn't he pine? couldn't we pine? couldn't you pine? couldn't they pine?	couldn't I be pining? couldn't you be pining? couldn't he be pining? couldn't we be pining? couldn't you be pining? couldn't they be pining?
Perfect	V-ing perfect
couldn't I have pined? couldn't you have pined? couldn't he have pined? couldn't we have pined? couldn't you have pined? couldn't they have pined?	couldn't I have been pining? couldn't you have been pining? couldn't he have been pining? couldn't we have been pining? couldn't you have been pining? couldn't they have been pining?