I could localise you could localise she could localise we could localise you could localise they could localise
V-ing form
I could be localising you could be localising she could be localising we could be localising you could be localising they could be localising
Perfect
I could have localised you could have localised she could have localised we could have localised you could have localised they could have localised
V-ing perfect
I could have been localising you could have been localising she could have been localising we could have been localising you could have been localising they could have been localising
Negation
Simple form
I couldn't localise you couldn't localise she couldn't localise we couldn't localise you couldn't localise they couldn't localise
V-ing form
I couldn't be localising you couldn't be localising she couldn't be localising we couldn't be localising you couldn't be localising they couldn't be localising
Perfect
I couldn't have localised you couldn't have localised she couldn't have localised we couldn't have localised you couldn't have localised they couldn't have localised
V-ing perfect
I couldn't have been localising you couldn't have been localising she couldn't have been localising we couldn't have been localising you couldn't have been localising they couldn't have been localising
Interrogative form
Simple form
could I localise? could you localise? could she localise? could we localise? could you localise? could they localise?
V-ing form
could I be localising? could you be localising? could she be localising? could we be localising? could you be localising? could they be localising?
Perfect
could I have localised? could you have localised? could she have localised? could we have localised? could you have localised? could they have localised?
V-ing perfect
could I have been localising? could you have been localising? could she have been localising? could we have been localising? could you have been localising? could they have been localising?
Interro-negative form
Simple form
couldn't I localise? couldn't you localise? couldn't she localise? couldn't we localise? couldn't you localise? couldn't they localise?
V-ing form
couldn't I be localising? couldn't you be localising? couldn't she be localising? couldn't we be localising? couldn't you be localising? couldn't they be localising?
Perfect
couldn't I have localised? couldn't you have localised? couldn't she have localised? couldn't we have localised? couldn't you have localised? couldn't they have localised?
V-ing perfect
couldn't I have been localising? couldn't you have been localising? couldn't she have been localising? couldn't we have been localising? couldn't you have been localising? couldn't they have been localising?