English verb conjugation
COULD INTERFERE

Regular verb: interfere - interfered - interfered

Affirmation

Simple form	V-ing form
I could interfere you could interfere he could interfere we could interfere you could interfere they could interfere	I could be interfering you could be interfering he could be interfering we could be interfering you could be interfering they could be interfering
Perfect	V-ing perfect
I could have interfered you could have interfered he could have interfered we could have interfered you could have interfered they could have interfered	I could have been interfering you could have been interfering he could have been interfering we could have been interfering you could have been interfering they could have been interfering

Negation

Simple form	V-ing form
I couldn't interfere you couldn't interfere he couldn't interfere we couldn't interfere you couldn't interfere they couldn't interfere	I couldn't be interfering you couldn't be interfering he couldn't be interfering we couldn't be interfering you couldn't be interfering they couldn't be interfering
Perfect	V-ing perfect
I couldn't have interfered you couldn't have interfered he couldn't have interfered we couldn't have interfered you couldn't have interfered they couldn't have interfered	I couldn't have been interfering you couldn't have been interfering he couldn't have been interfering we couldn't have been interfering you couldn't have been interfering they couldn't have been interfering

Interrogative form

Simple form	V-ing form
could I interfere? could you interfere? could he interfere? could we interfere? could you interfere? could they interfere?	could I be interfering? could you be interfering? could he be interfering? could we be interfering? could you be interfering? could they be interfering?
Perfect	V-ing perfect
could I have interfered? could you have interfered? could he have interfered? could we have interfered? could you have interfered? could they have interfered?	could I have been interfering? could you have been interfering? could he have been interfering? could we have been interfering? could you have been interfering? could they have been interfering?

Interro-negative form

Simple form	V-ing form
couldn't I interfere? couldn't you interfere? couldn't he interfere? couldn't we interfere? couldn't you interfere? couldn't they interfere?	couldn't I be interfering? couldn't you be interfering? couldn't he be interfering? couldn't we be interfering? couldn't you be interfering? couldn't they be interfering?
Perfect	V-ing perfect
couldn't I have interfered? couldn't you have interfered? couldn't he have interfered? couldn't we have interfered? couldn't you have interfered? couldn't they have interfered?	couldn't I have been interfering? couldn't you have been interfering? couldn't he have been interfering? couldn't we have been interfering? couldn't you have been interfering? couldn't they have been interfering?