I could subspecialise you could subspecialise she could subspecialise we could subspecialise you could subspecialise they could subspecialise
V-ing form
I could be subspecialising you could be subspecialising she could be subspecialising we could be subspecialising you could be subspecialising they could be subspecialising
Perfect
I could have subspecialised you could have subspecialised she could have subspecialised we could have subspecialised you could have subspecialised they could have subspecialised
V-ing perfect
I could have been subspecialising you could have been subspecialising she could have been subspecialising we could have been subspecialising you could have been subspecialising they could have been subspecialising
Negation
Simple form
I could not subspecialise you could not subspecialise she could not subspecialise we could not subspecialise you could not subspecialise they could not subspecialise
V-ing form
I could not be subspecialising you could not be subspecialising she could not be subspecialising we could not be subspecialising you could not be subspecialising they could not be subspecialising
Perfect
I could not have subspecialised you could not have subspecialised she could not have subspecialised we could not have subspecialised you could not have subspecialised they could not have subspecialised
V-ing perfect
I could not have been subspecialising you could not have been subspecialising she could not have been subspecialising we could not have been subspecialising you could not have been subspecialising they could not have been subspecialising
Interrogative form
Simple form
could I subspecialise? could you subspecialise? could she subspecialise? could we subspecialise? could you subspecialise? could they subspecialise?
V-ing form
could I be subspecialising? could you be subspecialising? could she be subspecialising? could we be subspecialising? could you be subspecialising? could they be subspecialising?
Perfect
could I have subspecialised? could you have subspecialised? could she have subspecialised? could we have subspecialised? could you have subspecialised? could they have subspecialised?
V-ing perfect
could I have been subspecialising? could you have been subspecialising? could she have been subspecialising? could we have been subspecialising? could you have been subspecialising? could they have been subspecialising?
Interro-negative form
Simple form
could I not subspecialise? could you not subspecialise? could she not subspecialise? could we not subspecialise? could you not subspecialise? could they not subspecialise?
V-ing form
could I not be subspecialising? could you not be subspecialising? could she not be subspecialising? could we not be subspecialising? could you not be subspecialising? could they not be subspecialising?
Perfect
could I not have subspecialised? could you not have subspecialised? could she not have subspecialised? could we not have subspecialised? could you not have subspecialised? could they not have subspecialised?
V-ing perfect
could I not have been subspecialising? could you not have been subspecialising? could she not have been subspecialising? could we not have been subspecialising? could you not have been subspecialising? could they not have been subspecialising?