I could adulterate you could adulterate she could adulterate we could adulterate you could adulterate they could adulterate
V-ing form
I could be adulterating you could be adulterating she could be adulterating we could be adulterating you could be adulterating they could be adulterating
Perfect
I could have adulterated you could have adulterated she could have adulterated we could have adulterated you could have adulterated they could have adulterated
V-ing perfect
I could have been adulterating you could have been adulterating she could have been adulterating we could have been adulterating you could have been adulterating they could have been adulterating
Negation
Simple form
I couldn't adulterate you couldn't adulterate she couldn't adulterate we couldn't adulterate you couldn't adulterate they couldn't adulterate
V-ing form
I couldn't be adulterating you couldn't be adulterating she couldn't be adulterating we couldn't be adulterating you couldn't be adulterating they couldn't be adulterating
Perfect
I couldn't have adulterated you couldn't have adulterated she couldn't have adulterated we couldn't have adulterated you couldn't have adulterated they couldn't have adulterated
V-ing perfect
I couldn't have been adulterating you couldn't have been adulterating she couldn't have been adulterating we couldn't have been adulterating you couldn't have been adulterating they couldn't have been adulterating
Interrogative form
Simple form
could I adulterate? could you adulterate? could she adulterate? could we adulterate? could you adulterate? could they adulterate?
V-ing form
could I be adulterating? could you be adulterating? could she be adulterating? could we be adulterating? could you be adulterating? could they be adulterating?
Perfect
could I have adulterated? could you have adulterated? could she have adulterated? could we have adulterated? could you have adulterated? could they have adulterated?
V-ing perfect
could I have been adulterating? could you have been adulterating? could she have been adulterating? could we have been adulterating? could you have been adulterating? could they have been adulterating?
Interro-negative form
Simple form
couldn't I adulterate? couldn't you adulterate? couldn't she adulterate? couldn't we adulterate? couldn't you adulterate? couldn't they adulterate?
V-ing form
couldn't I be adulterating? couldn't you be adulterating? couldn't she be adulterating? couldn't we be adulterating? couldn't you be adulterating? couldn't they be adulterating?
Perfect
couldn't I have adulterated? couldn't you have adulterated? couldn't she have adulterated? couldn't we have adulterated? couldn't you have adulterated? couldn't they have adulterated?
V-ing perfect
couldn't I have been adulterating? couldn't you have been adulterating? couldn't she have been adulterating? couldn't we have been adulterating? couldn't you have been adulterating? couldn't they have been adulterating?