I could lay you could lay she could lay we could lay you could lay they could lay
V-ing form
I could be laying you could be laying she could be laying we could be laying you could be laying they could be laying
Perfect
I could have laid you could have laid she could have laid we could have laid you could have laid they could have laid
V-ing perfect
I could have been laying you could have been laying she could have been laying we could have been laying you could have been laying they could have been laying
Negation
Simple form
I could not lay you could not lay she could not lay we could not lay you could not lay they could not lay
V-ing form
I could not be laying you could not be laying she could not be laying we could not be laying you could not be laying they could not be laying
Perfect
I could not have laid you could not have laid she could not have laid we could not have laid you could not have laid they could not have laid
V-ing perfect
I could not have been laying you could not have been laying she could not have been laying we could not have been laying you could not have been laying they could not have been laying
Interrogative form
Simple form
could I lay? could you lay? could she lay? could we lay? could you lay? could they lay?
V-ing form
could I be laying? could you be laying? could she be laying? could we be laying? could you be laying? could they be laying?
Perfect
could I have laid? could you have laid? could she have laid? could we have laid? could you have laid? could they have laid?
V-ing perfect
could I have been laying? could you have been laying? could she have been laying? could we have been laying? could you have been laying? could they have been laying?
Interro-negative form
Simple form
could I not lay? could you not lay? could she not lay? could we not lay? could you not lay? could they not lay?
V-ing form
could I not be laying? could you not be laying? could she not be laying? could we not be laying? could you not be laying? could they not be laying?
Perfect
could I not have laid? could you not have laid? could she not have laid? could we not have laid? could you not have laid? could they not have laid?
V-ing perfect
could I not have been laying? could you not have been laying? could she not have been laying? could we not have been laying? could you not have been laying? could they not have been laying?