I could leach you could leach she could leach we could leach you could leach they could leach
V-ing form
I could be leaching you could be leaching she could be leaching we could be leaching you could be leaching they could be leaching
Perfect
I could have leached you could have leached she 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 she 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 she 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 she 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 she 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 she 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 she leach? could we leach? could you leach? could they leach?
V-ing form
could I be leaching? could you be leaching? could she be leaching? could we be leaching? could you be leaching? could they be leaching?
Perfect
could I have leached? could you have leached? could she 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 she 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 she 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 she 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 she 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 she have been leaching? couldn't we have been leaching? couldn't you have been leaching? couldn't they have been leaching?