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