I could slenderise you could slenderise he could slenderise we could slenderise you could slenderise they could slenderise
V-ing form
I could be slenderising you could be slenderising he could be slenderising we could be slenderising you could be slenderising they could be slenderising
Perfect
I could have slenderised you could have slenderised he could have slenderised we could have slenderised you could have slenderised they could have slenderised
V-ing perfect
I could have been slenderising you could have been slenderising he could have been slenderising we could have been slenderising you could have been slenderising they could have been slenderising
Negation
Simple form
I could not slenderise you could not slenderise he could not slenderise we could not slenderise you could not slenderise they could not slenderise
V-ing form
I could not be slenderising you could not be slenderising he could not be slenderising we could not be slenderising you could not be slenderising they could not be slenderising
Perfect
I could not have slenderised you could not have slenderised he could not have slenderised we could not have slenderised you could not have slenderised they could not have slenderised
V-ing perfect
I could not have been slenderising you could not have been slenderising he could not have been slenderising we could not have been slenderising you could not have been slenderising they could not have been slenderising
Interrogative form
Simple form
could I slenderise? could you slenderise? could he slenderise? could we slenderise? could you slenderise? could they slenderise?
V-ing form
could I be slenderising? could you be slenderising? could he be slenderising? could we be slenderising? could you be slenderising? could they be slenderising?
Perfect
could I have slenderised? could you have slenderised? could he have slenderised? could we have slenderised? could you have slenderised? could they have slenderised?
V-ing perfect
could I have been slenderising? could you have been slenderising? could he have been slenderising? could we have been slenderising? could you have been slenderising? could they have been slenderising?
Interro-negative form
Simple form
could I not slenderise? could you not slenderise? could he not slenderise? could we not slenderise? could you not slenderise? could they not slenderise?
V-ing form
could I not be slenderising? could you not be slenderising? could he not be slenderising? could we not be slenderising? could you not be slenderising? could they not be slenderising?
Perfect
could I not have slenderised? could you not have slenderised? could he not have slenderised? could we not have slenderised? could you not have slenderised? could they not have slenderised?
V-ing perfect
could I not have been slenderising? could you not have been slenderising? could he not have been slenderising? could we not have been slenderising? could you not have been slenderising? could they not have been slenderising?