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