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