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