I can optimise you can optimise she can optimise we can optimise you can optimise they can optimise
V-ing form
I can be optimising you can be optimising she can be optimising we can be optimising you can be optimising they can be optimising
Perfect
I can have optimised you can have optimised she can have optimised we can have optimised you can have optimised they can have optimised
V-ing perfect
I can have been optimising you can have been optimising she can have been optimising we can have been optimising you can have been optimising they can have been optimising
Negation
Simple form
I cannot optimise you cannot optimise she cannot optimise we cannot optimise you cannot optimise they cannot optimise
V-ing form
I cannot be optimising you cannot be optimising she cannot be optimising we cannot be optimising you cannot be optimising they cannot be optimising
Perfect
I cannot have optimised you cannot have optimised she cannot have optimised we cannot have optimised you cannot have optimised they cannot have optimised
V-ing perfect
I cannot have been optimising you cannot have been optimising she cannot have been optimising we cannot have been optimising you cannot have been optimising they cannot have been optimising
Interrogative form
Simple form
can I optimise? can you optimise? can she optimise? can we optimise? can you optimise? can they optimise?
V-ing form
can I be optimising? can you be optimising? can she be optimising? can we be optimising? can you be optimising? can they be optimising?
Perfect
can I have optimised? can you have optimised? can she have optimised? can we have optimised? can you have optimised? can they have optimised?
V-ing perfect
can I have been optimising? can you have been optimising? can she have been optimising? can we have been optimising? can you have been optimising? can they have been optimising?
Interro-negative form
Simple form
can I not optimise? can you not optimise? can she not optimise? can we not optimise? can you not optimise? can they not optimise?
V-ing form
can I not be optimising? can you not be optimising? can she not be optimising? can we not be optimising? can you not be optimising? can they not be optimising?
Perfect
can I not have optimised? can you not have optimised? can she not have optimised? can we not have optimised? can you not have optimised? can they not have optimised?
V-ing perfect
can I not have been optimising? can you not have been optimising? can she not have been optimising? can we not have been optimising? can you not have been optimising? can they not have been optimising?