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