I could arabise you could arabise he could arabise we could arabise you could arabise they could arabise
V-ing form
I could be arabising you could be arabising he could be arabising we could be arabising you could be arabising they could be arabising
Perfect
I could have arabised you could have arabised he could have arabised we could have arabised you could have arabised they could have arabised
V-ing perfect
I could have been arabising you could have been arabising he could have been arabising we could have been arabising you could have been arabising they could have been arabising
Negation
Simple form
I couldn't arabise you couldn't arabise he couldn't arabise we couldn't arabise you couldn't arabise they couldn't arabise
V-ing form
I couldn't be arabising you couldn't be arabising he couldn't be arabising we couldn't be arabising you couldn't be arabising they couldn't be arabising
Perfect
I couldn't have arabised you couldn't have arabised he couldn't have arabised we couldn't have arabised you couldn't have arabised they couldn't have arabised
V-ing perfect
I couldn't have been arabising you couldn't have been arabising he couldn't have been arabising we couldn't have been arabising you couldn't have been arabising they couldn't have been arabising
Interrogative form
Simple form
could I arabise? could you arabise? could he arabise? could we arabise? could you arabise? could they arabise?
V-ing form
could I be arabising? could you be arabising? could he be arabising? could we be arabising? could you be arabising? could they be arabising?
Perfect
could I have arabised? could you have arabised? could he have arabised? could we have arabised? could you have arabised? could they have arabised?
V-ing perfect
could I have been arabising? could you have been arabising? could he have been arabising? could we have been arabising? could you have been arabising? could they have been arabising?
Interro-negative form
Simple form
couldn't I arabise? couldn't you arabise? couldn't he arabise? couldn't we arabise? couldn't you arabise? couldn't they arabise?
V-ing form
couldn't I be arabising? couldn't you be arabising? couldn't he be arabising? couldn't we be arabising? couldn't you be arabising? couldn't they be arabising?
Perfect
couldn't I have arabised? couldn't you have arabised? couldn't he have arabised? couldn't we have arabised? couldn't you have arabised? couldn't they have arabised?
V-ing perfect
couldn't I have been arabising? couldn't you have been arabising? couldn't he have been arabising? couldn't we have been arabising? couldn't you have been arabising? couldn't they have been arabising?