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 can't optimise you can't optimise she can't optimise we can't optimise you can't optimise they can't optimise
V-ing form
I can't be optimising you can't be optimising she can't be optimising we can't be optimising you can't be optimising they can't be optimising
Perfect
I can't have optimised you can't have optimised she can't have optimised we can't have optimised you can't have optimised they can't have optimised
V-ing perfect
I can't have been optimising you can't have been optimising she can't have been optimising we can't have been optimising you can't have been optimising they can't 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't I optimise? can't you optimise? can't she optimise? can't we optimise? can't you optimise? can't they optimise?
V-ing form
can't I be optimising? can't you be optimising? can't she be optimising? can't we be optimising? can't you be optimising? can't they be optimising?
Perfect
can't I have optimised? can't you have optimised? can't she have optimised? can't we have optimised? can't you have optimised? can't they have optimised?
V-ing perfect
can't I have been optimising? can't you have been optimising? can't she have been optimising? can't we have been optimising? can't you have been optimising? can't they have been optimising?