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