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