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