I could formularise you could formularise she could formularise we could formularise you could formularise they could formularise
V-ing form
I could be formularising you could be formularising she could be formularising we could be formularising you could be formularising they could be formularising
Perfect
I could have formularised you could have formularised she 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 she 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 she 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 she 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 she 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 she 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 she formularise? could we formularise? could you formularise? could they formularise?
V-ing form
could I be formularising? could you be formularising? could she be formularising? could we be formularising? could you be formularising? could they be formularising?
Perfect
could I have formularised? could you have formularised? could she 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 she 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 she 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 she 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 she 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 she have been formularising? couldn't we have been formularising? couldn't you have been formularising? couldn't they have been formularising?