I could aggrade you could aggrade he could aggrade we could aggrade you could aggrade they could aggrade
V-ing form
I could be aggrading you could be aggrading he could be aggrading we could be aggrading you could be aggrading they could be aggrading
Perfect
I could have aggraded you could have aggraded he could have aggraded we could have aggraded you could have aggraded they could have aggraded
V-ing perfect
I could have been aggrading you could have been aggrading he could have been aggrading we could have been aggrading you could have been aggrading they could have been aggrading
Negation
Simple form
I could not aggrade you could not aggrade he could not aggrade we could not aggrade you could not aggrade they could not aggrade
V-ing form
I could not be aggrading you could not be aggrading he could not be aggrading we could not be aggrading you could not be aggrading they could not be aggrading
Perfect
I could not have aggraded you could not have aggraded he could not have aggraded we could not have aggraded you could not have aggraded they could not have aggraded
V-ing perfect
I could not have been aggrading you could not have been aggrading he could not have been aggrading we could not have been aggrading you could not have been aggrading they could not have been aggrading
Interrogative form
Simple form
could I aggrade? could you aggrade? could he aggrade? could we aggrade? could you aggrade? could they aggrade?
V-ing form
could I be aggrading? could you be aggrading? could he be aggrading? could we be aggrading? could you be aggrading? could they be aggrading?
Perfect
could I have aggraded? could you have aggraded? could he have aggraded? could we have aggraded? could you have aggraded? could they have aggraded?
V-ing perfect
could I have been aggrading? could you have been aggrading? could he have been aggrading? could we have been aggrading? could you have been aggrading? could they have been aggrading?
Interro-negative form
Simple form
could I not aggrade? could you not aggrade? could he not aggrade? could we not aggrade? could you not aggrade? could they not aggrade?
V-ing form
could I not be aggrading? could you not be aggrading? could he not be aggrading? could we not be aggrading? could you not be aggrading? could they not be aggrading?
Perfect
could I not have aggraded? could you not have aggraded? could he not have aggraded? could we not have aggraded? could you not have aggraded? could they not have aggraded?
V-ing perfect
could I not have been aggrading? could you not have been aggrading? could he not have been aggrading? could we not have been aggrading? could you not have been aggrading? could they not have been aggrading?