I could saw you could saw she could saw we could saw you could saw they could saw
V-ing form
I could be sawing you could be sawing she could be sawing we could be sawing you could be sawing they could be sawing
Perfect
I could have sawed, sawn you could have sawed, sawn she could have sawed, sawn we could have sawed, sawn you could have sawed, sawn they could have sawed, sawn
V-ing perfect
I could have been sawing you could have been sawing she could have been sawing we could have been sawing you could have been sawing they could have been sawing
Negation
Simple form
I could not saw you could not saw she could not saw we could not saw you could not saw they could not saw
V-ing form
I could not be sawing you could not be sawing she could not be sawing we could not be sawing you could not be sawing they could not be sawing
Perfect
I could not have sawed, sawn you could not have sawed, sawn she could not have sawed, sawn we could not have sawed, sawn you could not have sawed, sawn they could not have sawed, sawn
V-ing perfect
I could not have been sawing you could not have been sawing she could not have been sawing we could not have been sawing you could not have been sawing they could not have been sawing
Interrogative form
Simple form
could I saw? could you saw? could she saw? could we saw? could you saw? could they saw?
V-ing form
could I be sawing? could you be sawing? could she be sawing? could we be sawing? could you be sawing? could they be sawing?
Perfect
could I have sawed, sawn? could you have sawed, sawn? could she have sawed, sawn? could we have sawed, sawn? could you have sawed, sawn? could they have sawed, sawn?
V-ing perfect
could I have been sawing? could you have been sawing? could she have been sawing? could we have been sawing? could you have been sawing? could they have been sawing?
Interro-negative form
Simple form
could I not saw? could you not saw? could she not saw? could we not saw? could you not saw? could they not saw?
V-ing form
could I not be sawing? could you not be sawing? could she not be sawing? could we not be sawing? could you not be sawing? could they not be sawing?
Perfect
could I not have sawed, sawn? could you not have sawed, sawn? could she not have sawed, sawn? could we not have sawed, sawn? could you not have sawed, sawn? could they not have sawed, sawn?
V-ing perfect
could I not have been sawing? could you not have been sawing? could she not have been sawing? could we not have been sawing? could you not have been sawing? could they not have been sawing?