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