English verb conjugation
COULD ROSIN

Regular verb: rosin - rosined - rosined

Affirmation

Simple form	V-ing form
I could rosin you could rosin he could rosin we could rosin you could rosin they could rosin	I could be rosining you could be rosining he could be rosining we could be rosining you could be rosining they could be rosining
Perfect	V-ing perfect
I could have rosined you could have rosined he could have rosined we could have rosined you could have rosined they could have rosined	I could have been rosining you could have been rosining he could have been rosining we could have been rosining you could have been rosining they could have been rosining

Negation

Simple form	V-ing form
I couldn't rosin you couldn't rosin he couldn't rosin we couldn't rosin you couldn't rosin they couldn't rosin	I couldn't be rosining you couldn't be rosining he couldn't be rosining we couldn't be rosining you couldn't be rosining they couldn't be rosining
Perfect	V-ing perfect
I couldn't have rosined you couldn't have rosined he couldn't have rosined we couldn't have rosined you couldn't have rosined they couldn't have rosined	I couldn't have been rosining you couldn't have been rosining he couldn't have been rosining we couldn't have been rosining you couldn't have been rosining they couldn't have been rosining

Interrogative form

Simple form	V-ing form
could I rosin? could you rosin? could he rosin? could we rosin? could you rosin? could they rosin?	could I be rosining? could you be rosining? could he be rosining? could we be rosining? could you be rosining? could they be rosining?
Perfect	V-ing perfect
could I have rosined? could you have rosined? could he have rosined? could we have rosined? could you have rosined? could they have rosined?	could I have been rosining? could you have been rosining? could he have been rosining? could we have been rosining? could you have been rosining? could they have been rosining?

Interro-negative form

Simple form	V-ing form
couldn't I rosin? couldn't you rosin? couldn't he rosin? couldn't we rosin? couldn't you rosin? couldn't they rosin?	couldn't I be rosining? couldn't you be rosining? couldn't he be rosining? couldn't we be rosining? couldn't you be rosining? couldn't they be rosining?
Perfect	V-ing perfect
couldn't I have rosined? couldn't you have rosined? couldn't he have rosined? couldn't we have rosined? couldn't you have rosined? couldn't they have rosined?	couldn't I have been rosining? couldn't you have been rosining? couldn't he have been rosining? couldn't we have been rosining? couldn't you have been rosining? couldn't they have been rosining?