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 can't concretise you can't concretise he can't concretise we can't concretise you can't concretise they can't concretise
V-ing form
I can't be concretising you can't be concretising he can't be concretising we can't be concretising you can't be concretising they can't be concretising
Perfect
I can't have concretised you can't have concretised he can't have concretised we can't have concretised you can't have concretised they can't have concretised
V-ing perfect
I can't have been concretising you can't have been concretising he can't have been concretising we can't have been concretising you can't have been concretising they can't 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't I concretise? can't you concretise? can't he concretise? can't we concretise? can't you concretise? can't they concretise?
V-ing form
can't I be concretising? can't you be concretising? can't he be concretising? can't we be concretising? can't you be concretising? can't they be concretising?
Perfect
can't I have concretised? can't you have concretised? can't he have concretised? can't we have concretised? can't you have concretised? can't they have concretised?
V-ing perfect
can't I have been concretising? can't you have been concretising? can't he have been concretising? can't we have been concretising? can't you have been concretising? can't they have been concretising?