I could soundproof you could soundproof she could soundproof we could soundproof you could soundproof they could soundproof
V-ing form
I could be soundproofing you could be soundproofing she could be soundproofing we could be soundproofing you could be soundproofing they could be soundproofing
Perfect
I could have soundproofed you could have soundproofed she could have soundproofed we could have soundproofed you could have soundproofed they could have soundproofed
V-ing perfect
I could have been soundproofing you could have been soundproofing she could have been soundproofing we could have been soundproofing you could have been soundproofing they could have been soundproofing
Negation
Simple form
I couldn't soundproof you couldn't soundproof she couldn't soundproof we couldn't soundproof you couldn't soundproof they couldn't soundproof
V-ing form
I couldn't be soundproofing you couldn't be soundproofing she couldn't be soundproofing we couldn't be soundproofing you couldn't be soundproofing they couldn't be soundproofing
Perfect
I couldn't have soundproofed you couldn't have soundproofed she couldn't have soundproofed we couldn't have soundproofed you couldn't have soundproofed they couldn't have soundproofed
V-ing perfect
I couldn't have been soundproofing you couldn't have been soundproofing she couldn't have been soundproofing we couldn't have been soundproofing you couldn't have been soundproofing they couldn't have been soundproofing
Interrogative form
Simple form
could I soundproof? could you soundproof? could she soundproof? could we soundproof? could you soundproof? could they soundproof?
V-ing form
could I be soundproofing? could you be soundproofing? could she be soundproofing? could we be soundproofing? could you be soundproofing? could they be soundproofing?
Perfect
could I have soundproofed? could you have soundproofed? could she have soundproofed? could we have soundproofed? could you have soundproofed? could they have soundproofed?
V-ing perfect
could I have been soundproofing? could you have been soundproofing? could she have been soundproofing? could we have been soundproofing? could you have been soundproofing? could they have been soundproofing?
Interro-negative form
Simple form
couldn't I soundproof? couldn't you soundproof? couldn't she soundproof? couldn't we soundproof? couldn't you soundproof? couldn't they soundproof?
V-ing form
couldn't I be soundproofing? couldn't you be soundproofing? couldn't she be soundproofing? couldn't we be soundproofing? couldn't you be soundproofing? couldn't they be soundproofing?
Perfect
couldn't I have soundproofed? couldn't you have soundproofed? couldn't she have soundproofed? couldn't we have soundproofed? couldn't you have soundproofed? couldn't they have soundproofed?
V-ing perfect
couldn't I have been soundproofing? couldn't you have been soundproofing? couldn't she have been soundproofing? couldn't we have been soundproofing? couldn't you have been soundproofing? couldn't they have been soundproofing?