I could pasture you could pasture she could pasture we could pasture you could pasture they could pasture
V-ing form
I could be pasturing you could be pasturing she could be pasturing we could be pasturing you could be pasturing they could be pasturing
Perfect
I could have pastured you could have pastured she could have pastured we could have pastured you could have pastured they could have pastured
V-ing perfect
I could have been pasturing you could have been pasturing she could have been pasturing we could have been pasturing you could have been pasturing they could have been pasturing
Negation
Simple form
I couldn't pasture you couldn't pasture she couldn't pasture we couldn't pasture you couldn't pasture they couldn't pasture
V-ing form
I couldn't be pasturing you couldn't be pasturing she couldn't be pasturing we couldn't be pasturing you couldn't be pasturing they couldn't be pasturing
Perfect
I couldn't have pastured you couldn't have pastured she couldn't have pastured we couldn't have pastured you couldn't have pastured they couldn't have pastured
V-ing perfect
I couldn't have been pasturing you couldn't have been pasturing she couldn't have been pasturing we couldn't have been pasturing you couldn't have been pasturing they couldn't have been pasturing
Interrogative form
Simple form
could I pasture? could you pasture? could she pasture? could we pasture? could you pasture? could they pasture?
V-ing form
could I be pasturing? could you be pasturing? could she be pasturing? could we be pasturing? could you be pasturing? could they be pasturing?
Perfect
could I have pastured? could you have pastured? could she have pastured? could we have pastured? could you have pastured? could they have pastured?
V-ing perfect
could I have been pasturing? could you have been pasturing? could she have been pasturing? could we have been pasturing? could you have been pasturing? could they have been pasturing?
Interro-negative form
Simple form
couldn't I pasture? couldn't you pasture? couldn't she pasture? couldn't we pasture? couldn't you pasture? couldn't they pasture?
V-ing form
couldn't I be pasturing? couldn't you be pasturing? couldn't she be pasturing? couldn't we be pasturing? couldn't you be pasturing? couldn't they be pasturing?
Perfect
couldn't I have pastured? couldn't you have pastured? couldn't she have pastured? couldn't we have pastured? couldn't you have pastured? couldn't they have pastured?
V-ing perfect
couldn't I have been pasturing? couldn't you have been pasturing? couldn't she have been pasturing? couldn't we have been pasturing? couldn't you have been pasturing? couldn't they have been pasturing?