I could lubricate you could lubricate he could lubricate we could lubricate you could lubricate they could lubricate
V-ing form
I could be lubricating you could be lubricating he could be lubricating we could be lubricating you could be lubricating they could be lubricating
Perfect
I could have lubricated you could have lubricated he could have lubricated we could have lubricated you could have lubricated they could have lubricated
V-ing perfect
I could have been lubricating you could have been lubricating he could have been lubricating we could have been lubricating you could have been lubricating they could have been lubricating
Negation
Simple form
I could not lubricate you could not lubricate he could not lubricate we could not lubricate you could not lubricate they could not lubricate
V-ing form
I could not be lubricating you could not be lubricating he could not be lubricating we could not be lubricating you could not be lubricating they could not be lubricating
Perfect
I could not have lubricated you could not have lubricated he could not have lubricated we could not have lubricated you could not have lubricated they could not have lubricated
V-ing perfect
I could not have been lubricating you could not have been lubricating he could not have been lubricating we could not have been lubricating you could not have been lubricating they could not have been lubricating
Interrogative form
Simple form
could I lubricate? could you lubricate? could he lubricate? could we lubricate? could you lubricate? could they lubricate?
V-ing form
could I be lubricating? could you be lubricating? could he be lubricating? could we be lubricating? could you be lubricating? could they be lubricating?
Perfect
could I have lubricated? could you have lubricated? could he have lubricated? could we have lubricated? could you have lubricated? could they have lubricated?
V-ing perfect
could I have been lubricating? could you have been lubricating? could he have been lubricating? could we have been lubricating? could you have been lubricating? could they have been lubricating?
Interro-negative form
Simple form
could I not lubricate? could you not lubricate? could he not lubricate? could we not lubricate? could you not lubricate? could they not lubricate?
V-ing form
could I not be lubricating? could you not be lubricating? could he not be lubricating? could we not be lubricating? could you not be lubricating? could they not be lubricating?
Perfect
could I not have lubricated? could you not have lubricated? could he not have lubricated? could we not have lubricated? could you not have lubricated? could they not have lubricated?
V-ing perfect
could I not have been lubricating? could you not have been lubricating? could he not have been lubricating? could we not have been lubricating? could you not have been lubricating? could they not have been lubricating?