English verb conjugation
COULD CONTAMINATE

Regular verb: contaminate - contaminated - contaminated

Affirmation

Simple form	V-ing form
I could contaminate you could contaminate he could contaminate we could contaminate you could contaminate they could contaminate	I could be contaminating you could be contaminating he could be contaminating we could be contaminating you could be contaminating they could be contaminating
Perfect	V-ing perfect
I could have contaminated you could have contaminated he could have contaminated we could have contaminated you could have contaminated they could have contaminated	I could have been contaminating you could have been contaminating he could have been contaminating we could have been contaminating you could have been contaminating they could have been contaminating

Negation

Simple form	V-ing form
I could not contaminate you could not contaminate he could not contaminate we could not contaminate you could not contaminate they could not contaminate	I could not be contaminating you could not be contaminating he could not be contaminating we could not be contaminating you could not be contaminating they could not be contaminating
Perfect	V-ing perfect
I could not have contaminated you could not have contaminated he could not have contaminated we could not have contaminated you could not have contaminated they could not have contaminated	I could not have been contaminating you could not have been contaminating he could not have been contaminating we could not have been contaminating you could not have been contaminating they could not have been contaminating

Interrogative form

Simple form	V-ing form
could I contaminate? could you contaminate? could he contaminate? could we contaminate? could you contaminate? could they contaminate?	could I be contaminating? could you be contaminating? could he be contaminating? could we be contaminating? could you be contaminating? could they be contaminating?
Perfect	V-ing perfect
could I have contaminated? could you have contaminated? could he have contaminated? could we have contaminated? could you have contaminated? could they have contaminated?	could I have been contaminating? could you have been contaminating? could he have been contaminating? could we have been contaminating? could you have been contaminating? could they have been contaminating?

Interro-negative form

Simple form	V-ing form
could I not contaminate? could you not contaminate? could he not contaminate? could we not contaminate? could you not contaminate? could they not contaminate?	could I not be contaminating? could you not be contaminating? could he not be contaminating? could we not be contaminating? could you not be contaminating? could they not be contaminating?
Perfect	V-ing perfect
could I not have contaminated? could you not have contaminated? could he not have contaminated? could we not have contaminated? could you not have contaminated? could they not have contaminated?	could I not have been contaminating? could you not have been contaminating? could he not have been contaminating? could we not have been contaminating? could you not have been contaminating? could they not have been contaminating?