I could formalise you could formalise he could formalise we could formalise you could formalise they could formalise
V-ing form
I could be formalising you could be formalising he could be formalising we could be formalising you could be formalising they could be formalising
Perfect
I could have formalised you could have formalised he could have formalised we could have formalised you could have formalised they could have formalised
V-ing perfect
I could have been formalising you could have been formalising he could have been formalising we could have been formalising you could have been formalising they could have been formalising
Negation
Simple form
I could not formalise you could not formalise he could not formalise we could not formalise you could not formalise they could not formalise
V-ing form
I could not be formalising you could not be formalising he could not be formalising we could not be formalising you could not be formalising they could not be formalising
Perfect
I could not have formalised you could not have formalised he could not have formalised we could not have formalised you could not have formalised they could not have formalised
V-ing perfect
I could not have been formalising you could not have been formalising he could not have been formalising we could not have been formalising you could not have been formalising they could not have been formalising
Interrogative form
Simple form
could I formalise? could you formalise? could he formalise? could we formalise? could you formalise? could they formalise?
V-ing form
could I be formalising? could you be formalising? could he be formalising? could we be formalising? could you be formalising? could they be formalising?
Perfect
could I have formalised? could you have formalised? could he have formalised? could we have formalised? could you have formalised? could they have formalised?
V-ing perfect
could I have been formalising? could you have been formalising? could he have been formalising? could we have been formalising? could you have been formalising? could they have been formalising?
Interro-negative form
Simple form
could I not formalise? could you not formalise? could he not formalise? could we not formalise? could you not formalise? could they not formalise?
V-ing form
could I not be formalising? could you not be formalising? could he not be formalising? could we not be formalising? could you not be formalising? could they not be formalising?
Perfect
could I not have formalised? could you not have formalised? could he not have formalised? could we not have formalised? could you not have formalised? could they not have formalised?
V-ing perfect
could I not have been formalising? could you not have been formalising? could he not have been formalising? could we not have been formalising? could you not have been formalising? could they not have been formalising?