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 cannot ruin you cannot ruin he cannot ruin we cannot ruin you cannot ruin they cannot ruin	I cannot be ruining you cannot be ruining he cannot be ruining we cannot be ruining you cannot be ruining they cannot be ruining
Perfect	V-ing perfect
I cannot have ruined you cannot have ruined he cannot have ruined we cannot have ruined you cannot have ruined they cannot have ruined	I cannot have been ruining you cannot have been ruining he cannot have been ruining we cannot have been ruining you cannot have been ruining they cannot 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 I not ruin? can you not ruin? can he not ruin? can we not ruin? can you not ruin? can they not ruin?	can I not be ruining? can you not be ruining? can he not be ruining? can we not be ruining? can you not be ruining? can they not be ruining?
Perfect	V-ing perfect
can I not have ruined? can you not have ruined? can he not have ruined? can we not have ruined? can you not have ruined? can they not have ruined?	can I not have been ruining? can you not have been ruining? can he not have been ruining? can we not have been ruining? can you not have been ruining? can they not have been ruining?