I could ligate you could ligate he could ligate we could ligate you could ligate they could ligate
V-ing form
I could be ligating you could be ligating he could be ligating we could be ligating you could be ligating they could be ligating
Perfect
I could have ligated you could have ligated he could have ligated we could have ligated you could have ligated they could have ligated
V-ing perfect
I could have been ligating you could have been ligating he could have been ligating we could have been ligating you could have been ligating they could have been ligating
Negation
Simple form
I could not ligate you could not ligate he could not ligate we could not ligate you could not ligate they could not ligate
V-ing form
I could not be ligating you could not be ligating he could not be ligating we could not be ligating you could not be ligating they could not be ligating
Perfect
I could not have ligated you could not have ligated he could not have ligated we could not have ligated you could not have ligated they could not have ligated
V-ing perfect
I could not have been ligating you could not have been ligating he could not have been ligating we could not have been ligating you could not have been ligating they could not have been ligating
Interrogative form
Simple form
could I ligate? could you ligate? could he ligate? could we ligate? could you ligate? could they ligate?
V-ing form
could I be ligating? could you be ligating? could he be ligating? could we be ligating? could you be ligating? could they be ligating?
Perfect
could I have ligated? could you have ligated? could he have ligated? could we have ligated? could you have ligated? could they have ligated?
V-ing perfect
could I have been ligating? could you have been ligating? could he have been ligating? could we have been ligating? could you have been ligating? could they have been ligating?
Interro-negative form
Simple form
could I not ligate? could you not ligate? could he not ligate? could we not ligate? could you not ligate? could they not ligate?
V-ing form
could I not be ligating? could you not be ligating? could he not be ligating? could we not be ligating? could you not be ligating? could they not be ligating?
Perfect
could I not have ligated? could you not have ligated? could he not have ligated? could we not have ligated? could you not have ligated? could they not have ligated?
V-ing perfect
could I not have been ligating? could you not have been ligating? could he not have been ligating? could we not have been ligating? could you not have been ligating? could they not have been ligating?