I could singularise you could singularise he could singularise we could singularise you could singularise they could singularise
V-ing form
I could be singularising you could be singularising he could be singularising we could be singularising you could be singularising they could be singularising
Perfect
I could have singularised you could have singularised he could have singularised we could have singularised you could have singularised they could have singularised
V-ing perfect
I could have been singularising you could have been singularising he could have been singularising we could have been singularising you could have been singularising they could have been singularising
Negation
Simple form
I could not singularise you could not singularise he could not singularise we could not singularise you could not singularise they could not singularise
V-ing form
I could not be singularising you could not be singularising he could not be singularising we could not be singularising you could not be singularising they could not be singularising
Perfect
I could not have singularised you could not have singularised he could not have singularised we could not have singularised you could not have singularised they could not have singularised
V-ing perfect
I could not have been singularising you could not have been singularising he could not have been singularising we could not have been singularising you could not have been singularising they could not have been singularising
Interrogative form
Simple form
could I singularise? could you singularise? could he singularise? could we singularise? could you singularise? could they singularise?
V-ing form
could I be singularising? could you be singularising? could he be singularising? could we be singularising? could you be singularising? could they be singularising?
Perfect
could I have singularised? could you have singularised? could he have singularised? could we have singularised? could you have singularised? could they have singularised?
V-ing perfect
could I have been singularising? could you have been singularising? could he have been singularising? could we have been singularising? could you have been singularising? could they have been singularising?
Interro-negative form
Simple form
could I not singularise? could you not singularise? could he not singularise? could we not singularise? could you not singularise? could they not singularise?
V-ing form
could I not be singularising? could you not be singularising? could he not be singularising? could we not be singularising? could you not be singularising? could they not be singularising?
Perfect
could I not have singularised? could you not have singularised? could he not have singularised? could we not have singularised? could you not have singularised? could they not have singularised?
V-ing perfect
could I not have been singularising? could you not have been singularising? could he not have been singularising? could we not have been singularising? could you not have been singularising? could they not have been singularising?