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