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