I could draught-proof you could draught-proof she could draught-proof we could draught-proof you could draught-proof they could draught-proof
V-ing form
I could be draught-proofing you could be draught-proofing she could be draught-proofing we could be draught-proofing you could be draught-proofing they could be draught-proofing
Perfect
I could have draught-proofed you could have draught-proofed she could have draught-proofed we could have draught-proofed you could have draught-proofed they could have draught-proofed
V-ing perfect
I could have been draught-proofing you could have been draught-proofing she could have been draught-proofing we could have been draught-proofing you could have been draught-proofing they could have been draught-proofing
Negation
Simple form
I could not draught-proof you could not draught-proof she could not draught-proof we could not draught-proof you could not draught-proof they could not draught-proof
V-ing form
I could not be draught-proofing you could not be draught-proofing she could not be draught-proofing we could not be draught-proofing you could not be draught-proofing they could not be draught-proofing
Perfect
I could not have draught-proofed you could not have draught-proofed she could not have draught-proofed we could not have draught-proofed you could not have draught-proofed they could not have draught-proofed
V-ing perfect
I could not have been draught-proofing you could not have been draught-proofing she could not have been draught-proofing we could not have been draught-proofing you could not have been draught-proofing they could not have been draught-proofing
Interrogative form
Simple form
could I draught-proof? could you draught-proof? could she draught-proof? could we draught-proof? could you draught-proof? could they draught-proof?
V-ing form
could I be draught-proofing? could you be draught-proofing? could she be draught-proofing? could we be draught-proofing? could you be draught-proofing? could they be draught-proofing?
Perfect
could I have draught-proofed? could you have draught-proofed? could she have draught-proofed? could we have draught-proofed? could you have draught-proofed? could they have draught-proofed?
V-ing perfect
could I have been draught-proofing? could you have been draught-proofing? could she have been draught-proofing? could we have been draught-proofing? could you have been draught-proofing? could they have been draught-proofing?
Interro-negative form
Simple form
could I not draught-proof? could you not draught-proof? could she not draught-proof? could we not draught-proof? could you not draught-proof? could they not draught-proof?
V-ing form
could I not be draught-proofing? could you not be draught-proofing? could she not be draught-proofing? could we not be draught-proofing? could you not be draught-proofing? could they not be draught-proofing?
Perfect
could I not have draught-proofed? could you not have draught-proofed? could she not have draught-proofed? could we not have draught-proofed? could you not have draught-proofed? could they not have draught-proofed?
V-ing perfect
could I not have been draught-proofing? could you not have been draught-proofing? could she not have been draught-proofing? could we not have been draught-proofing? could you not have been draught-proofing? could they not have been draught-proofing?