I can subspecialise you can subspecialise he can subspecialise we can subspecialise you can subspecialise they can subspecialise
V-ing form
I can be subspecialising you can be subspecialising he can be subspecialising we can be subspecialising you can be subspecialising they can be subspecialising
Perfect
I can have subspecialised you can have subspecialised he can have subspecialised we can have subspecialised you can have subspecialised they can have subspecialised
V-ing perfect
I can have been subspecialising you can have been subspecialising he can have been subspecialising we can have been subspecialising you can have been subspecialising they can have been subspecialising
Negation
Simple form
I can't subspecialise you can't subspecialise he can't subspecialise we can't subspecialise you can't subspecialise they can't subspecialise
V-ing form
I can't be subspecialising you can't be subspecialising he can't be subspecialising we can't be subspecialising you can't be subspecialising they can't be subspecialising
Perfect
I can't have subspecialised you can't have subspecialised he can't have subspecialised we can't have subspecialised you can't have subspecialised they can't have subspecialised
V-ing perfect
I can't have been subspecialising you can't have been subspecialising he can't have been subspecialising we can't have been subspecialising you can't have been subspecialising they can't have been subspecialising
Interrogative form
Simple form
can I subspecialise? can you subspecialise? can he subspecialise? can we subspecialise? can you subspecialise? can they subspecialise?
V-ing form
can I be subspecialising? can you be subspecialising? can he be subspecialising? can we be subspecialising? can you be subspecialising? can they be subspecialising?
Perfect
can I have subspecialised? can you have subspecialised? can he have subspecialised? can we have subspecialised? can you have subspecialised? can they have subspecialised?
V-ing perfect
can I have been subspecialising? can you have been subspecialising? can he have been subspecialising? can we have been subspecialising? can you have been subspecialising? can they have been subspecialising?
Interro-negative form
Simple form
can't I subspecialise? can't you subspecialise? can't he subspecialise? can't we subspecialise? can't you subspecialise? can't they subspecialise?
V-ing form
can't I be subspecialising? can't you be subspecialising? can't he be subspecialising? can't we be subspecialising? can't you be subspecialising? can't they be subspecialising?
Perfect
can't I have subspecialised? can't you have subspecialised? can't he have subspecialised? can't we have subspecialised? can't you have subspecialised? can't they have subspecialised?
V-ing perfect
can't I have been subspecialising? can't you have been subspecialising? can't he have been subspecialising? can't we have been subspecialising? can't you have been subspecialising? can't they have been subspecialising?