English verb conjugation
COULD DRAUGHT-PROOF

Regular verb: draught-proof - draught-proofed - draught-proofed

Affirmation

Simple form	V-ing form
I could draught-proof you could draught-proof he could draught-proof we could draught-proof you could draught-proof they could draught-proof	I could be draught-proofing you could be draught-proofing he could be draught-proofing we could be draught-proofing you could be draught-proofing they could be draught-proofing
Perfect	V-ing perfect
I could have draught-proofed you could have draught-proofed he could have draught-proofed we could have draught-proofed you could have draught-proofed they could have draught-proofed	I could have been draught-proofing you could have been draught-proofing he 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	V-ing form
I couldn't draught-proof you couldn't draught-proof he couldn't draught-proof we couldn't draught-proof you couldn't draught-proof they couldn't draught-proof	I couldn't be draught-proofing you couldn't be draught-proofing he couldn't be draught-proofing we couldn't be draught-proofing you couldn't be draught-proofing they couldn't be draught-proofing
Perfect	V-ing perfect
I couldn't have draught-proofed you couldn't have draught-proofed he couldn't have draught-proofed we couldn't have draught-proofed you couldn't have draught-proofed they couldn't have draught-proofed	I couldn't have been draught-proofing you couldn't have been draught-proofing he couldn't have been draught-proofing we couldn't have been draught-proofing you couldn't have been draught-proofing they couldn't have been draught-proofing

Interrogative form

Simple form	V-ing form
could I draught-proof? could you draught-proof? could he draught-proof? could we draught-proof? could you draught-proof? could they draught-proof?	could I be draught-proofing? could you be draught-proofing? could he be draught-proofing? could we be draught-proofing? could you be draught-proofing? could they be draught-proofing?
Perfect	V-ing perfect
could I have draught-proofed? could you have draught-proofed? could he have draught-proofed? could we have draught-proofed? could you have draught-proofed? could they have draught-proofed?	could I have been draught-proofing? could you have been draught-proofing? could he 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	V-ing form
couldn't I draught-proof? couldn't you draught-proof? couldn't he draught-proof? couldn't we draught-proof? couldn't you draught-proof? couldn't they draught-proof?	couldn't I be draught-proofing? couldn't you be draught-proofing? couldn't he be draught-proofing? couldn't we be draught-proofing? couldn't you be draught-proofing? couldn't they be draught-proofing?
Perfect	V-ing perfect
couldn't I have draught-proofed? couldn't you have draught-proofed? couldn't he have draught-proofed? couldn't we have draught-proofed? couldn't you have draught-proofed? couldn't they have draught-proofed?	couldn't I have been draught-proofing? couldn't you have been draught-proofing? couldn't he have been draught-proofing? couldn't we have been draught-proofing? couldn't you have been draught-proofing? couldn't they have been draught-proofing?