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