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