I can philosophise you can philosophise she can philosophise we can philosophise you can philosophise they can philosophise
V-ing form
I can be philosophising you can be philosophising she can be philosophising we can be philosophising you can be philosophising they can be philosophising
Perfect
I can have philosophised you can have philosophised she 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 she 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 she 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 she 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 she 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 she 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 she philosophise? can we philosophise? can you philosophise? can they philosophise?
V-ing form
can I be philosophising? can you be philosophising? can she be philosophising? can we be philosophising? can you be philosophising? can they be philosophising?
Perfect
can I have philosophised? can you have philosophised? can she 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 she 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 she 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 she 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 she 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 she have been philosophising? can't we have been philosophising? can't you have been philosophising? can't they have been philosophising?