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