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