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