English verb conjugation
CAN RUIN

Regular verb: ruin - ruined - ruined

Affirmation

Simple form	V-ing form
I can ruin you can ruin he can ruin we can ruin you can ruin they can ruin	I can be ruining you can be ruining he can be ruining we can be ruining you can be ruining they can be ruining
Perfect	V-ing perfect
I can have ruined you can have ruined he can have ruined we can have ruined you can have ruined they can have ruined	I can have been ruining you can have been ruining he can have been ruining we can have been ruining you can have been ruining they can have been ruining

Negation

Simple form	V-ing form
I can't ruin you can't ruin he can't ruin we can't ruin you can't ruin they can't ruin	I can't be ruining you can't be ruining he can't be ruining we can't be ruining you can't be ruining they can't be ruining
Perfect	V-ing perfect
I can't have ruined you can't have ruined he can't have ruined we can't have ruined you can't have ruined they can't have ruined	I can't have been ruining you can't have been ruining he can't have been ruining we can't have been ruining you can't have been ruining they can't have been ruining

Interrogative form

Simple form	V-ing form
can I ruin? can you ruin? can he ruin? can we ruin? can you ruin? can they ruin?	can I be ruining? can you be ruining? can he be ruining? can we be ruining? can you be ruining? can they be ruining?
Perfect	V-ing perfect
can I have ruined? can you have ruined? can he have ruined? can we have ruined? can you have ruined? can they have ruined?	can I have been ruining? can you have been ruining? can he have been ruining? can we have been ruining? can you have been ruining? can they have been ruining?

Interro-negative form

Simple form	V-ing form
can't I ruin? can't you ruin? can't he ruin? can't we ruin? can't you ruin? can't they ruin?	can't I be ruining? can't you be ruining? can't he be ruining? can't we be ruining? can't you be ruining? can't they be ruining?
Perfect	V-ing perfect
can't I have ruined? can't you have ruined? can't he have ruined? can't we have ruined? can't you have ruined? can't they have ruined?	can't I have been ruining? can't you have been ruining? can't he have been ruining? can't we have been ruining? can't you have been ruining? can't they have been ruining?