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