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 couldn't slenderise you couldn't slenderise she couldn't slenderise we couldn't slenderise you couldn't slenderise they couldn't slenderise
V-ing form
I couldn't be slenderising you couldn't be slenderising she couldn't be slenderising we couldn't be slenderising you couldn't be slenderising they couldn't be slenderising
Perfect
I couldn't have slenderised you couldn't have slenderised she couldn't have slenderised we couldn't have slenderised you couldn't have slenderised they couldn't have slenderised
V-ing perfect
I couldn't have been slenderising you couldn't have been slenderising she couldn't have been slenderising we couldn't have been slenderising you couldn't have been slenderising they couldn't 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
couldn't I slenderise? couldn't you slenderise? couldn't she slenderise? couldn't we slenderise? couldn't you slenderise? couldn't they slenderise?
V-ing form
couldn't I be slenderising? couldn't you be slenderising? couldn't she be slenderising? couldn't we be slenderising? couldn't you be slenderising? couldn't they be slenderising?
Perfect
couldn't I have slenderised? couldn't you have slenderised? couldn't she have slenderised? couldn't we have slenderised? couldn't you have slenderised? couldn't they have slenderised?
V-ing perfect
couldn't I have been slenderising? couldn't you have been slenderising? couldn't she have been slenderising? couldn't we have been slenderising? couldn't you have been slenderising? couldn't they have been slenderising?