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