English verb conjugation
COULD ROBE

Regular verb: robe - robed - robed

Affirmation

Simple form	V-ing form
I could robe you could robe he could robe we could robe you could robe they could robe	I could be robing you could be robing he could be robing we could be robing you could be robing they could be robing
Perfect	V-ing perfect
I could have robed you could have robed he could have robed we could have robed you could have robed they could have robed	I could have been robing you could have been robing he could have been robing we could have been robing you could have been robing they could have been robing

Negation

Simple form	V-ing form
I couldn't robe you couldn't robe he couldn't robe we couldn't robe you couldn't robe they couldn't robe	I couldn't be robing you couldn't be robing he couldn't be robing we couldn't be robing you couldn't be robing they couldn't be robing
Perfect	V-ing perfect
I couldn't have robed you couldn't have robed he couldn't have robed we couldn't have robed you couldn't have robed they couldn't have robed	I couldn't have been robing you couldn't have been robing he couldn't have been robing we couldn't have been robing you couldn't have been robing they couldn't have been robing

Interrogative form

Simple form	V-ing form
could I robe? could you robe? could he robe? could we robe? could you robe? could they robe?	could I be robing? could you be robing? could he be robing? could we be robing? could you be robing? could they be robing?
Perfect	V-ing perfect
could I have robed? could you have robed? could he have robed? could we have robed? could you have robed? could they have robed?	could I have been robing? could you have been robing? could he have been robing? could we have been robing? could you have been robing? could they have been robing?

Interro-negative form

Simple form	V-ing form
couldn't I robe? couldn't you robe? couldn't he robe? couldn't we robe? couldn't you robe? couldn't they robe?	couldn't I be robing? couldn't you be robing? couldn't he be robing? couldn't we be robing? couldn't you be robing? couldn't they be robing?
Perfect	V-ing perfect
couldn't I have robed? couldn't you have robed? couldn't he have robed? couldn't we have robed? couldn't you have robed? couldn't they have robed?	couldn't I have been robing? couldn't you have been robing? couldn't he have been robing? couldn't we have been robing? couldn't you have been robing? couldn't they have been robing?