I can concretise you can concretise he can concretise we can concretise you can concretise they can concretise
V-ing form
I can be concretising you can be concretising he can be concretising we can be concretising you can be concretising they can be concretising
Perfect
I can have concretised you can have concretised he can have concretised we can have concretised you can have concretised they can have concretised
V-ing perfect
I can have been concretising you can have been concretising he can have been concretising we can have been concretising you can have been concretising they can have been concretising
Negation
Simple form
I cannot concretise you cannot concretise he cannot concretise we cannot concretise you cannot concretise they cannot concretise
V-ing form
I cannot be concretising you cannot be concretising he cannot be concretising we cannot be concretising you cannot be concretising they cannot be concretising
Perfect
I cannot have concretised you cannot have concretised he cannot have concretised we cannot have concretised you cannot have concretised they cannot have concretised
V-ing perfect
I cannot have been concretising you cannot have been concretising he cannot have been concretising we cannot have been concretising you cannot have been concretising they cannot have been concretising
Interrogative form
Simple form
can I concretise? can you concretise? can he concretise? can we concretise? can you concretise? can they concretise?
V-ing form
can I be concretising? can you be concretising? can he be concretising? can we be concretising? can you be concretising? can they be concretising?
Perfect
can I have concretised? can you have concretised? can he have concretised? can we have concretised? can you have concretised? can they have concretised?
V-ing perfect
can I have been concretising? can you have been concretising? can he have been concretising? can we have been concretising? can you have been concretising? can they have been concretising?
Interro-negative form
Simple form
can I not concretise? can you not concretise? can he not concretise? can we not concretise? can you not concretise? can they not concretise?
V-ing form
can I not be concretising? can you not be concretising? can he not be concretising? can we not be concretising? can you not be concretising? can they not be concretising?
Perfect
can I not have concretised? can you not have concretised? can he not have concretised? can we not have concretised? can you not have concretised? can they not have concretised?
V-ing perfect
can I not have been concretising? can you not have been concretising? can he not have been concretising? can we not have been concretising? can you not have been concretising? can they not have been concretising?