I could crochet you could crochet she could crochet we could crochet you could crochet they could crochet
V-ing form
I could be crocheting you could be crocheting she could be crocheting we could be crocheting you could be crocheting they could be crocheting
Perfect
I could have crocheted you could have crocheted she could have crocheted we could have crocheted you could have crocheted they could have crocheted
V-ing perfect
I could have been crocheting you could have been crocheting she could have been crocheting we could have been crocheting you could have been crocheting they could have been crocheting
Negation
Simple form
I could not crochet you could not crochet she could not crochet we could not crochet you could not crochet they could not crochet
V-ing form
I could not be crocheting you could not be crocheting she could not be crocheting we could not be crocheting you could not be crocheting they could not be crocheting
Perfect
I could not have crocheted you could not have crocheted she could not have crocheted we could not have crocheted you could not have crocheted they could not have crocheted
V-ing perfect
I could not have been crocheting you could not have been crocheting she could not have been crocheting we could not have been crocheting you could not have been crocheting they could not have been crocheting
Interrogative form
Simple form
could I crochet? could you crochet? could she crochet? could we crochet? could you crochet? could they crochet?
V-ing form
could I be crocheting? could you be crocheting? could she be crocheting? could we be crocheting? could you be crocheting? could they be crocheting?
Perfect
could I have crocheted? could you have crocheted? could she have crocheted? could we have crocheted? could you have crocheted? could they have crocheted?
V-ing perfect
could I have been crocheting? could you have been crocheting? could she have been crocheting? could we have been crocheting? could you have been crocheting? could they have been crocheting?
Interro-negative form
Simple form
could I not crochet? could you not crochet? could she not crochet? could we not crochet? could you not crochet? could they not crochet?
V-ing form
could I not be crocheting? could you not be crocheting? could she not be crocheting? could we not be crocheting? could you not be crocheting? could they not be crocheting?
Perfect
could I not have crocheted? could you not have crocheted? could she not have crocheted? could we not have crocheted? could you not have crocheted? could they not have crocheted?
V-ing perfect
could I not have been crocheting? could you not have been crocheting? could she not have been crocheting? could we not have been crocheting? could you not have been crocheting? could they not have been crocheting?