I could formulise you could formulise he could formulise we could formulise you could formulise they could formulise
V-ing form
I could be formulising you could be formulising he could be formulising we could be formulising you could be formulising they could be formulising
Perfect
I could have formulised you could have formulised he could have formulised we could have formulised you could have formulised they could have formulised
V-ing perfect
I could have been formulising you could have been formulising he could have been formulising we could have been formulising you could have been formulising they could have been formulising
Negation
Simple form
I could not formulise you could not formulise he could not formulise we could not formulise you could not formulise they could not formulise
V-ing form
I could not be formulising you could not be formulising he could not be formulising we could not be formulising you could not be formulising they could not be formulising
Perfect
I could not have formulised you could not have formulised he could not have formulised we could not have formulised you could not have formulised they could not have formulised
V-ing perfect
I could not have been formulising you could not have been formulising he could not have been formulising we could not have been formulising you could not have been formulising they could not have been formulising
Interrogative form
Simple form
could I formulise? could you formulise? could he formulise? could we formulise? could you formulise? could they formulise?
V-ing form
could I be formulising? could you be formulising? could he be formulising? could we be formulising? could you be formulising? could they be formulising?
Perfect
could I have formulised? could you have formulised? could he have formulised? could we have formulised? could you have formulised? could they have formulised?
V-ing perfect
could I have been formulising? could you have been formulising? could he have been formulising? could we have been formulising? could you have been formulising? could they have been formulising?
Interro-negative form
Simple form
could I not formulise? could you not formulise? could he not formulise? could we not formulise? could you not formulise? could they not formulise?
V-ing form
could I not be formulising? could you not be formulising? could he not be formulising? could we not be formulising? could you not be formulising? could they not be formulising?
Perfect
could I not have formulised? could you not have formulised? could he not have formulised? could we not have formulised? could you not have formulised? could they not have formulised?
V-ing perfect
could I not have been formulising? could you not have been formulising? could he not have been formulising? could we not have been formulising? could you not have been formulising? could they not have been formulising?