I can contaminate you can contaminate he can contaminate we can contaminate you can contaminate they can contaminate
V-ing form
I can be contaminating you can be contaminating he can be contaminating we can be contaminating you can be contaminating they can be contaminating
Perfect
I can have contaminated you can have contaminated he can have contaminated we can have contaminated you can have contaminated they can have contaminated
V-ing perfect
I can have been contaminating you can have been contaminating he can have been contaminating we can have been contaminating you can have been contaminating they can have been contaminating
Negation
Simple form
I can't contaminate you can't contaminate he can't contaminate we can't contaminate you can't contaminate they can't contaminate
V-ing form
I can't be contaminating you can't be contaminating he can't be contaminating we can't be contaminating you can't be contaminating they can't be contaminating
Perfect
I can't have contaminated you can't have contaminated he can't have contaminated we can't have contaminated you can't have contaminated they can't have contaminated
V-ing perfect
I can't have been contaminating you can't have been contaminating he can't have been contaminating we can't have been contaminating you can't have been contaminating they can't have been contaminating
Interrogative form
Simple form
can I contaminate? can you contaminate? can he contaminate? can we contaminate? can you contaminate? can they contaminate?
V-ing form
can I be contaminating? can you be contaminating? can he be contaminating? can we be contaminating? can you be contaminating? can they be contaminating?
Perfect
can I have contaminated? can you have contaminated? can he have contaminated? can we have contaminated? can you have contaminated? can they have contaminated?
V-ing perfect
can I have been contaminating? can you have been contaminating? can he have been contaminating? can we have been contaminating? can you have been contaminating? can they have been contaminating?
Interro-negative form
Simple form
can't I contaminate? can't you contaminate? can't he contaminate? can't we contaminate? can't you contaminate? can't they contaminate?
V-ing form
can't I be contaminating? can't you be contaminating? can't he be contaminating? can't we be contaminating? can't you be contaminating? can't they be contaminating?
Perfect
can't I have contaminated? can't you have contaminated? can't he have contaminated? can't we have contaminated? can't you have contaminated? can't they have contaminated?
V-ing perfect
can't I have been contaminating? can't you have been contaminating? can't he have been contaminating? can't we have been contaminating? can't you have been contaminating? can't they have been contaminating?