I can philosophise you can philosophise he can philosophise we can philosophise you can philosophise they can philosophise
V-ing form
I can be philosophising you can be philosophising he can be philosophising we can be philosophising you can be philosophising they can be philosophising
Perfect
I can have philosophised you can have philosophised he can have philosophised we can have philosophised you can have philosophised they can have philosophised
V-ing perfect
I can have been philosophising you can have been philosophising he can have been philosophising we can have been philosophising you can have been philosophising they can have been philosophising
Negation
Simple form
I can't philosophise you can't philosophise he can't philosophise we can't philosophise you can't philosophise they can't philosophise
V-ing form
I can't be philosophising you can't be philosophising he can't be philosophising we can't be philosophising you can't be philosophising they can't be philosophising
Perfect
I can't have philosophised you can't have philosophised he can't have philosophised we can't have philosophised you can't have philosophised they can't have philosophised
V-ing perfect
I can't have been philosophising you can't have been philosophising he can't have been philosophising we can't have been philosophising you can't have been philosophising they can't have been philosophising
Interrogative form
Simple form
can I philosophise? can you philosophise? can he philosophise? can we philosophise? can you philosophise? can they philosophise?
V-ing form
can I be philosophising? can you be philosophising? can he be philosophising? can we be philosophising? can you be philosophising? can they be philosophising?
Perfect
can I have philosophised? can you have philosophised? can he have philosophised? can we have philosophised? can you have philosophised? can they have philosophised?
V-ing perfect
can I have been philosophising? can you have been philosophising? can he have been philosophising? can we have been philosophising? can you have been philosophising? can they have been philosophising?
Interro-negative form
Simple form
can't I philosophise? can't you philosophise? can't he philosophise? can't we philosophise? can't you philosophise? can't they philosophise?
V-ing form
can't I be philosophising? can't you be philosophising? can't he be philosophising? can't we be philosophising? can't you be philosophising? can't they be philosophising?
Perfect
can't I have philosophised? can't you have philosophised? can't he have philosophised? can't we have philosophised? can't you have philosophised? can't they have philosophised?
V-ing perfect
can't I have been philosophising? can't you have been philosophising? can't he have been philosophising? can't we have been philosophising? can't you have been philosophising? can't they have been philosophising?