I could manufacture you could manufacture he could manufacture we could manufacture you could manufacture they could manufacture
V-ing form
I could be manufacturing you could be manufacturing he could be manufacturing we could be manufacturing you could be manufacturing they could be manufacturing
Perfect
I could have manufactured you could have manufactured he could have manufactured we could have manufactured you could have manufactured they could have manufactured
V-ing perfect
I could have been manufacturing you could have been manufacturing he could have been manufacturing we could have been manufacturing you could have been manufacturing they could have been manufacturing
Negation
Simple form
I couldn't manufacture you couldn't manufacture he couldn't manufacture we couldn't manufacture you couldn't manufacture they couldn't manufacture
V-ing form
I couldn't be manufacturing you couldn't be manufacturing he couldn't be manufacturing we couldn't be manufacturing you couldn't be manufacturing they couldn't be manufacturing
Perfect
I couldn't have manufactured you couldn't have manufactured he couldn't have manufactured we couldn't have manufactured you couldn't have manufactured they couldn't have manufactured
V-ing perfect
I couldn't have been manufacturing you couldn't have been manufacturing he couldn't have been manufacturing we couldn't have been manufacturing you couldn't have been manufacturing they couldn't have been manufacturing
Interrogative form
Simple form
could I manufacture? could you manufacture? could he manufacture? could we manufacture? could you manufacture? could they manufacture?
V-ing form
could I be manufacturing? could you be manufacturing? could he be manufacturing? could we be manufacturing? could you be manufacturing? could they be manufacturing?
Perfect
could I have manufactured? could you have manufactured? could he have manufactured? could we have manufactured? could you have manufactured? could they have manufactured?
V-ing perfect
could I have been manufacturing? could you have been manufacturing? could he have been manufacturing? could we have been manufacturing? could you have been manufacturing? could they have been manufacturing?
Interro-negative form
Simple form
couldn't I manufacture? couldn't you manufacture? couldn't he manufacture? couldn't we manufacture? couldn't you manufacture? couldn't they manufacture?
V-ing form
couldn't I be manufacturing? couldn't you be manufacturing? couldn't he be manufacturing? couldn't we be manufacturing? couldn't you be manufacturing? couldn't they be manufacturing?
Perfect
couldn't I have manufactured? couldn't you have manufactured? couldn't he have manufactured? couldn't we have manufactured? couldn't you have manufactured? couldn't they have manufactured?
V-ing perfect
couldn't I have been manufacturing? couldn't you have been manufacturing? couldn't he have been manufacturing? couldn't we have been manufacturing? couldn't you have been manufacturing? couldn't they have been manufacturing?