I could crochet you could crochet he could crochet we could crochet you could crochet they could crochet
V-ing form
I could be crocheting you could be crocheting he could be crocheting we could be crocheting you could be crocheting they could be crocheting
Perfect
I could have crocheted you could have crocheted he 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 he could have been crocheting we could have been crocheting you could have been crocheting they could have been crocheting
Negation
Simple form
I couldn't crochet you couldn't crochet he couldn't crochet we couldn't crochet you couldn't crochet they couldn't crochet
V-ing form
I couldn't be crocheting you couldn't be crocheting he couldn't be crocheting we couldn't be crocheting you couldn't be crocheting they couldn't be crocheting
Perfect
I couldn't have crocheted you couldn't have crocheted he couldn't have crocheted we couldn't have crocheted you couldn't have crocheted they couldn't have crocheted
V-ing perfect
I couldn't have been crocheting you couldn't have been crocheting he couldn't have been crocheting we couldn't have been crocheting you couldn't have been crocheting they couldn't have been crocheting
Interrogative form
Simple form
could I crochet? could you crochet? could he crochet? could we crochet? could you crochet? could they crochet?
V-ing form
could I be crocheting? could you be crocheting? could he be crocheting? could we be crocheting? could you be crocheting? could they be crocheting?
Perfect
could I have crocheted? could you have crocheted? could he 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 he have been crocheting? could we have been crocheting? could you have been crocheting? could they have been crocheting?
Interro-negative form
Simple form
couldn't I crochet? couldn't you crochet? couldn't he crochet? couldn't we crochet? couldn't you crochet? couldn't they crochet?
V-ing form
couldn't I be crocheting? couldn't you be crocheting? couldn't he be crocheting? couldn't we be crocheting? couldn't you be crocheting? couldn't they be crocheting?
Perfect
couldn't I have crocheted? couldn't you have crocheted? couldn't he have crocheted? couldn't we have crocheted? couldn't you have crocheted? couldn't they have crocheted?
V-ing perfect
couldn't I have been crocheting? couldn't you have been crocheting? couldn't he have been crocheting? couldn't we have been crocheting? couldn't you have been crocheting? couldn't they have been crocheting?