I could slenderise you could slenderise she could slenderise we could slenderise you could slenderise they could slenderise
V-ing form
I could be slenderising you could be slenderising she could be slenderising we could be slenderising you could be slenderising they could be slenderising
Perfect
I could have slenderised you could have slenderised she 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 she 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 she 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 she 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 she 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 she 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 she slenderise? could we slenderise? could you slenderise? could they slenderise?
V-ing form
could I be slenderising? could you be slenderising? could she be slenderising? could we be slenderising? could you be slenderising? could they be slenderising?
Perfect
could I have slenderised? could you have slenderised? could she 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 she 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 she 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 she 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 she 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 she not have been slenderising? could we not have been slenderising? could you not have been slenderising? could they not have been slenderising?