I can specialise you can specialise she can specialise we can specialise you can specialise they can specialise
V-ing form
I can be specialising you can be specialising she can be specialising we can be specialising you can be specialising they can be specialising
Perfect
I can have specialised you can have specialised she can have specialised we can have specialised you can have specialised they can have specialised
V-ing perfect
I can have been specialising you can have been specialising she can have been specialising we can have been specialising you can have been specialising they can have been specialising
Negation
Simple form
I cannot specialise you cannot specialise she cannot specialise we cannot specialise you cannot specialise they cannot specialise
V-ing form
I cannot be specialising you cannot be specialising she cannot be specialising we cannot be specialising you cannot be specialising they cannot be specialising
Perfect
I cannot have specialised you cannot have specialised she cannot have specialised we cannot have specialised you cannot have specialised they cannot have specialised
V-ing perfect
I cannot have been specialising you cannot have been specialising she cannot have been specialising we cannot have been specialising you cannot have been specialising they cannot have been specialising
Interrogative form
Simple form
can I specialise? can you specialise? can she specialise? can we specialise? can you specialise? can they specialise?
V-ing form
can I be specialising? can you be specialising? can she be specialising? can we be specialising? can you be specialising? can they be specialising?
Perfect
can I have specialised? can you have specialised? can she have specialised? can we have specialised? can you have specialised? can they have specialised?
V-ing perfect
can I have been specialising? can you have been specialising? can she have been specialising? can we have been specialising? can you have been specialising? can they have been specialising?
Interro-negative form
Simple form
can I not specialise? can you not specialise? can she not specialise? can we not specialise? can you not specialise? can they not specialise?
V-ing form
can I not be specialising? can you not be specialising? can she not be specialising? can we not be specialising? can you not be specialising? can they not be specialising?
Perfect
can I not have specialised? can you not have specialised? can she not have specialised? can we not have specialised? can you not have specialised? can they not have specialised?
V-ing perfect
can I not have been specialising? can you not have been specialising? can she not have been specialising? can we not have been specialising? can you not have been specialising? can they not have been specialising?