English verb conjugation
COULD PILFER

Regular verb: pilfer - pilfered - pilfered

Affirmation

Simple form	V-ing form
I could pilfer you could pilfer he could pilfer we could pilfer you could pilfer they could pilfer	I could be pilfering you could be pilfering he could be pilfering we could be pilfering you could be pilfering they could be pilfering
Perfect	V-ing perfect
I could have pilfered you could have pilfered he could have pilfered we could have pilfered you could have pilfered they could have pilfered	I could have been pilfering you could have been pilfering he could have been pilfering we could have been pilfering you could have been pilfering they could have been pilfering

Negation

Simple form	V-ing form
I couldn't pilfer you couldn't pilfer he couldn't pilfer we couldn't pilfer you couldn't pilfer they couldn't pilfer	I couldn't be pilfering you couldn't be pilfering he couldn't be pilfering we couldn't be pilfering you couldn't be pilfering they couldn't be pilfering
Perfect	V-ing perfect
I couldn't have pilfered you couldn't have pilfered he couldn't have pilfered we couldn't have pilfered you couldn't have pilfered they couldn't have pilfered	I couldn't have been pilfering you couldn't have been pilfering he couldn't have been pilfering we couldn't have been pilfering you couldn't have been pilfering they couldn't have been pilfering

Interrogative form

Simple form	V-ing form
could I pilfer? could you pilfer? could he pilfer? could we pilfer? could you pilfer? could they pilfer?	could I be pilfering? could you be pilfering? could he be pilfering? could we be pilfering? could you be pilfering? could they be pilfering?
Perfect	V-ing perfect
could I have pilfered? could you have pilfered? could he have pilfered? could we have pilfered? could you have pilfered? could they have pilfered?	could I have been pilfering? could you have been pilfering? could he have been pilfering? could we have been pilfering? could you have been pilfering? could they have been pilfering?

Interro-negative form

Simple form	V-ing form
couldn't I pilfer? couldn't you pilfer? couldn't he pilfer? couldn't we pilfer? couldn't you pilfer? couldn't they pilfer?	couldn't I be pilfering? couldn't you be pilfering? couldn't he be pilfering? couldn't we be pilfering? couldn't you be pilfering? couldn't they be pilfering?
Perfect	V-ing perfect
couldn't I have pilfered? couldn't you have pilfered? couldn't he have pilfered? couldn't we have pilfered? couldn't you have pilfered? couldn't they have pilfered?	couldn't I have been pilfering? couldn't you have been pilfering? couldn't he have been pilfering? couldn't we have been pilfering? couldn't you have been pilfering? couldn't they have been pilfering?